Annual report [Section 13 and 15(d), not S-K Item 405]

Note 12 - Stockholders' Equity (Details Textual)

Note 12 - Stockholders' Equity (Details Textual)											1 Months Ended		3 Months Ended								12 Months Ended
Note 12 - Stockholders' Equity (Details Textual)	Oct. 16, 2025 USD ($) $ / shares	Oct. 15, 2025 USD ($) $ / shares shares	Aug. 04, 2025	Jul. 22, 2025 shares	May 15, 2025 USD ($) shares	Dec. 19, 2024 shares	Dec. 18, 2024 USD ($) $ / shares shares	Nov. 05, 2024	Oct. 03, 2024 USD ($)	May 31, 2024 USD ($) $ / shares shares	May 31, 2024 USD ($) $ / shares shares	Jul. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2025 USD ($) $ / shares shares	Sep. 30, 2025 USD ($) shares	Jun. 30, 2025 USD ($) shares	Mar. 31, 2025 USD ($) shares	Dec. 31, 2024 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) shares	Jun. 30, 2024 USD ($) shares	Mar. 31, 2024 USD ($) shares	Dec. 31, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2019 shares	Oct. 31, 2025 USD ($) $ / shares shares	Aug. 22, 2024 USD ($)	Aug. 31, 2023 USD ($) $ / shares shares
Common Stock, Shares Authorized (in shares)													300,000,000				300,000,000				300,000,000	300,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) \| $ / shares	$ 0.001												$ 0.001				$ 0.001				$ 0.001	$ 0.001
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation \| $																					$ 147,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)																						1,064
Proceeds from Issuance Or Sale Of Equity, Net \| $																					$ 11,939,000	$ 7,306,000
The 2019 Stock Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)				400,000																			140,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)				260,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)																							3 years
Supplemental Retention Program [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)									6 years
Minimum [Member] \| Supplemental Retention Program [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Settlement Value \| $									$ 0
Maximum [Member] \| The 2019 Stock Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)																							10 years
Maximum [Member] \| Supplemental Retention Program [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Settlement Value \| $									$ 925,014
Pre-Funded Warrants [Member]
Class of Warrant or Right, Issued During Period (in shares)		928,581
Class of Warrant or Right, Offering Price (in dollars per share) \| $ / shares		$ 11.339
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)		1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares		$ 0.001
Proceeds from Issuance of Warrants \| $		$ 5,125,000
Common Stock Purchase Warrants [Member]
Class of Warrant or Right, Issued During Period (in shares)		1,133,794
Class of Warrant or Right, Offering Price (in dollars per share) \| $ / shares		$ 0.125
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares		$ 11.34
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		1					75,000						75,000								75,000
Warrants and Rights Outstanding, Term (Year)							5 years
Proceeds from Issuance of Warrants \| $		$ 5,682,000					$ 986,000
Common Stock Purchase Warrants [Member] \| Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares							$ 19.2
Common Stock Purchase Warrants [Member] \| Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares							$ 19.3
Private Placement Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares																								$ 11.34
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)																	75,000					75,000		1,133,794
Warrants and Rights Outstanding, Term (Year)		5 years															5 years					5 years		5 years
Warrants and Rights Outstanding \| $																								$ 14,348,000
Private Placement Warrants [Member] \| Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares																	$ 19.2					$ 19.2
Private Placement Warrants [Member] \| Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares																	$ 19.3					$ 19.3
Private Placement Warrants [Member] \| Measurement Input, Share Price [Member]
Warrants and Rights Outstanding \| $																								$ 13.94
Private Placement Warrants [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input																								142
Private Placement Warrants [Member] \| Measurement Input, Discount Rate [Member]
Warrants and Rights Outstanding, Measurement Input																								3.63
Private Placement Warrants [Member] \| Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input																								0
May 2024 Public Offering Warrants [Member]
Stock Issued During Period, Shares, New Issues (in shares)										100,625
Shares Issued, Price Per Share (in dollars per share) \| $ / shares										$ 78	$ 78
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)										1	1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares										$ 2	$ 2
Warrants and Rights Outstanding \| $										$ 3,081,000	$ 3,081,000
Public Offering Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares												$ 275
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)												1,819
Warrants and Rights Outstanding, Term (Year)												5 years
Warrants and Rights Outstanding \| $												$ 388,000
Sale of Stock, Warrants, Commission Percent												2.00%
Public Offering Warrant [Member] \| Measurement Input, Share Price [Member]
Warrants and Rights Outstanding \| $												$ 308
Public Offering Warrant [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input												0.819
Public Offering Warrant [Member] \| Measurement Input, Discount Rate [Member]
Warrants and Rights Outstanding, Measurement Input												0.0381
Public Offering Warrant [Member] \| Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input												0
Yulho SPA Underwriter Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares																										$ 250
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)																										1,029
Warrants and Rights Outstanding, Term (Year)																										5 years
Warrants and Rights Outstanding \| $																										$ 181,000
Yulho SPA Underwriter Warrant [Member] \| Measurement Input, Share Price [Member]
Warrants and Rights Outstanding \| $																										$ 254
Yulho SPA Underwriter Warrant [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input																										82.3
Yulho SPA Underwriter Warrant [Member] \| Measurement Input, Discount Rate [Member]
Warrants and Rights Outstanding, Measurement Input																										3.81
Yulho SPA Underwriter Warrant [Member] \| Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input																										0
May 2024 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares										$ 78	$ 78
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)										100,625	100,625
Warrants and Rights Outstanding, Term (Year)										5 years	5 years
Warrants and Rights Outstanding \| $										$ 6,666,000	$ 6,666,000
May 2024 Warrants [Member] \| Measurement Input, Share Price [Member]
Warrants and Rights Outstanding \| $										$ 94.2	$ 94.2
May 2024 Warrants [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input										80.3	80.3
May 2024 Warrants [Member] \| Measurement Input, Discount Rate [Member]
Warrants and Rights Outstanding, Measurement Input										4.46	4.46
May 2024 Warrants [Member] \| Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input										0	0
Stock Options and Restricted Stock Units [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount \| $													$ 1,955,000								$ 1,955,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)																					2 years 2 months 12 days
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)																6 months			3 years	3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)																2,500		2,011	624	557
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $																$ 49,000		$ 150,000	$ 40,000	$ 60,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments																			3	3
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested \| $																					$ 552,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding \| $													$ 1,188,000								$ 1,188,000
Restricted Stock Units (RSUs) [Member] \| Vesting in Four Equal Installments [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)															12 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)															21,739
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $															$ 250,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments															4
Restricted Stock Units (RSUs) [Member] \| Vesting Immediately [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)															4,567
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $															$ 85,000
Restricted Stock Units (RSUs) [Member] \| Long-term Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)						47,445
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period (Year)						3 years
Performance Stock Units (PSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)																					236,028	82,866
Performance Stock Units (PSUs) [Member] \| Long-term Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)						15,881
Performance Shares [Member] \| Long-term Incentive Plan [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)						1 year
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage						50.00%
Performance Shares [Member] \| Long-term Incentive Plan [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)						3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage						50.00%
Performance Shares [Member] \| Long-term Incentive Plan [Member] \| Peer Group 25th Percentile Tranche [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage						50.00%
Performance Shares [Member] \| Long-term Incentive Plan [Member] \| Peer Group 50th Percentile Tranche [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage						100.00%
Performance Shares [Member] \| Long-term Incentive Plan [Member] \| Peer Group 75th Percentile Tranche [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage						200.00%
Management and Employees [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)																					62,531	7,856
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)																					19,508	5,225
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation \| $																						$ 552,000
Management and Employees [Member] \| Reissued Treasury Stock [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)																					17,144	4,426
Director [Member]
Stock Issued During Period, Shares, New Issues (in shares)																						942
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)																					9,365	1,068
Stock Issued During Period, Shares, Issued for Services (in shares)																					4,568
Consulting Fees [Member]
Stock Issued During Period, Shares, Issued for Services (in shares)																						2,011
Former Employee [Member]
Stock Issued During Period, Shares, New Issues (in shares)																						660
Employee One [Member] \| Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)													3 years			3 years	3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)													70,878			535	396
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $													$ 702,401			$ 10,000	$ 10,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments													6			3	3
Qualified Employees [Member] \| Supplemental Retention Program [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)																6 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)																11,847
Qualified Employees [Member] \| Restricted Stock Units (RSUs) [Member] \| Supplemental Retention Program [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)																11,847
Employee Two [Member] \| Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)															3 years		3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)													14,749	11,250	10,204		17,776
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $													$ 80,530	$ 46,350	$ 100,000		$ 311,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments															3		6
Employee [Member] \| Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)														3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)														99,606				660
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $														$ 377,000				$ 28,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments														3
Board Members [Member] \| Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)																		9 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)																		1,857
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $																		$ 83,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments																		4
Lincoln Park Capital Fund, LLC [Member]
Stock Issued During Period, Shares, New Issues (in shares)																					22,717
Underwriter [Member] \| May 2024 Public Offering Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares										$ 97.5	$ 97.5
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)										3,913	3,913
Warrants and Rights Outstanding, Term (Year)										5 years	5 years
Warrants and Rights Outstanding \| $										$ 245,000	$ 245,000
Sale of Stock, Warrants, Commission Percent										2.00%	2.00%
Underwriter [Member] \| May 2024 Public Offering Warrants [Member] \| Measurement Input, Share Price [Member]
Warrants and Rights Outstanding \| $										$ 94.2	$ 94.2
Underwriter [Member] \| May 2024 Public Offering Warrants [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input										80.3	80.3
Underwriter [Member] \| May 2024 Public Offering Warrants [Member] \| Measurement Input, Discount Rate [Member]
Warrants and Rights Outstanding, Measurement Input										4.46	4.46
Underwriter [Member] \| May 2024 Public Offering Warrants [Member] \| Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input										0	0
ATM [Member]
Equity Offering, Maximum Amount \| $	$ 30,000,000												$ 50,000,000								$ 50,000,000				$ 30,000,000
Equity Offering, Compensation From Gross Proceeds, Percent																									2.50%
Stock Issued During Period, Shares, New Issues (in shares)																					836,219	119,503
Proceeds from Issuance of Common Stock \| $																					$ 5,931,000	$ 5,014,000
Stock Issued During Period, Value, New Issues \| $																					5,931,000	5,014,000
ELOC [Member]
Equity Offering, Maximum Amount \| $					$ 10,000,000
Proceeds from Issuance of Common Stock \| $																					903,000	0
Equity Offering, Period (Month)					24 months
Equity Offering, Maximum Shares (in shares)					177,283
Stock Issued During Period, Value, New Issues \| $																					$ 903,000
ELOC [Member] \| Lincoln [Member]
Stock Issued During Period, Shares, New Issues (in shares)																					177,283
Stock Issued During Period, Value, New Issues \| $																					$ 903,000
Equity Offering, Shares Issued for Commitment Fee (in shares)																					22,717
Securities Purchase Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)		205,213
Stock Issued During Period, Value, New Issues \| $		$ 1,133,000
Shares Issued, Price Per Share (in dollars per share) \| $ / shares		$ 11.34
Proceeds from Issuance or Sale of Equity \| $	$ 11,939,000
May 2024 Public Offering [Member]
Proceeds from Issuance or Sale of Equity \| $											$ 7,306,000
Proceeds from Issuance Or Sale Of Equity, Net \| $											$ 4,225,000
Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)												90,965
Stock Issued During Period, Value, New Issues \| $																					$ 11,939,000	$ 7,306,000
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio			10					20