Quarterly report [Sections 13 or 15(d)]

Note 12 - Stockholders' Equity (Details Textual)

Note 12 - Stockholders' Equity (Details Textual)							1 Months Ended	3 Months Ended		6 Months Ended		126 Months Ended
Note 12 - Stockholders' Equity (Details Textual)	Jul. 22, 2025 shares	Jun. 30, 2025 shares	May 15, 2025 USD ($) shares	Oct. 03, 2024 USD ($) shares	May 31, 2024 USD ($) $ / shares shares	May 23, 2024 shares	May 31, 2024 USD ($) $ / shares shares	Jun. 30, 2025 USD ($) shares	Mar. 31, 2025 USD ($) shares	Jun. 30, 2025 USD ($) shares	Jun. 30, 2024 USD ($) shares	Jun. 30, 2025 shares
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)											344
Proceeds from Issuance Or Sale Of Equity, Net \| $										$ 0	$ 7,306,000
The 2019 Stock Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)						47,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)						140,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)		143,149
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)		73,758						73,758		73,758		73,758
Shares Reclassified to Liabilities (in shares)		69,391						69,391		69,391		69,391
The 2019 Stock Incentive Plan [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)												10 years
The 2019 Stock Incentive Plan [Member] \| Subsequent Event [Member]
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, Number of Shares Authorized (in shares)	400,000
Supplemental Retention Program [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)				6 months
Supplemental Retention Program [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Settlement Value \| $				$ 925,014
Supplemental Retention Program [Member] \| Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Settlement Value \| $				$ 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]
Sale of Stock, Warrants, Commission Percent					2.00%		2.00%
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
Proceeds from Issuance of Warrants \| $							$ 3,000,000
Warrants and Rights Outstanding, Term (Year)					5 years		5 years
May 2024 Warrants [Member] \| Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Term (Year)					5 years		5 years
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, Number of Securities Called by Warrants or Rights (in shares)					3,912		3,912
Underwriter [Member] \| May 2024 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares					$ 97.5		$ 97.5
Proceeds from Issuance of Warrants \| $					$ 100,000
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)									2,500	51,392
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $									$ 49,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)									6 months
Restricted Stock Units (RSUs) [Member] \| Vesting in Four Equal Installments [Member]
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
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)								12 months
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
Management and Employees [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)										5,835	5,322
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)										2,648	2,283
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation \| $										$ 67,000	$ 360,000
Management and Employees [Member] \| Reissued Treasury Stock [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)										2,942	2,143
Director [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)										671
Stock Issued During Period, Shares, Issued for Services (in shares)										4,568
Board Members [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)											397
Employee One [Member] \| Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)									535
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $									$ 10,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments									3
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)									3 years
Qualified Employees [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, Equity Instruments Other than Options, Grants in Period (in shares)								10,204
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $								$ 100,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments								3
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)								3 years
ELOC [Member]
Equity Offering, Maximum Amount \| $			$ 10,000,000
Equity Offering, Period (Month)			24 months
Equity Offering, Maximum Shares (in shares)			177,283
Stock Issued During Period, Shares, New Issues (in shares)										12,000
Proceeds from Issuance of Common Stock \| $										$ 69,000	$ 0
ATM [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)											25,197
Stock Issued During Period, Shares, Issued for Services (in shares)											2,542,000
Stock Issued During Period, Shares, New Issues (in shares)										211,474
Proceeds from Issuance of Common Stock \| $										$ 2,735,000	$ 2,542,000
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