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				9 Months Ended		129 Months Ended
Note 12 - Stockholders' Equity (Details Textual)	Oct. 16, 2025 USD ($)	Jul. 22, 2025 shares	May 15, 2025 USD ($) shares	Oct. 03, 2024 USD ($) shares	May 31, 2024 USD ($) $ / shares shares	May 23, 2024 shares	May 31, 2024 USD ($) $ / shares shares	Sep. 30, 2025 USD ($) shares	Jun. 30, 2025 USD ($) shares	Mar. 31, 2025 USD ($) shares	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2025 USD ($)	Oct. 01, 2025 shares	Aug. 22, 2024 USD ($)
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)		260,000				47,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)		400,000				140,000
The 2019 Stock Incentive Plan [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)														10 years
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
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		162,248
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)												46,082	12,986
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)												12,541	5,225
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation \| $												$ 108,000	$ 552,000
Management and Employees [Member] \| Reissued Treasury Stock [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)												7,636	4,426
Director [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)												5,017	733
Stock Issued During Period, Shares, Issued for Services (in shares)												4,568	517
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, 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)								11,250	10,204
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $								$ 46,350	$ 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
Employee [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)								99,606
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value \| $								$ 377,000
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
Subsequent Event [Member]
Proceeds from Issuance or Sale of Equity \| $	$ 12,000,000
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
ATM [Member]
Equity Offering, Maximum Amount \| $								$ 30,000,000				$ 30,000,000		$ 30,000,000		$ 30,000,000
Equity Offering, Compensation From Gross Proceeds, Percent																2.50%
Stock Issued During Period, Shares, New Issues (in shares)												833,219	30,605
Stock Issued During Period, Value, New Issues \| $								3,186,000			$ 277,000	$ 5,921,000	$ 2,820,000
Equity Offering, Remaining Availability \| $								0				0		0
Proceeds from Issuance of Common Stock \| $												5,921,000	2,820,000
ELOC [Member]
Equity Offering, Maximum Amount \| $			$ 10,000,000
Stock Issued During Period, Value, New Issues \| $								834,000				903,000
Equity Offering, Period (Month)			24 months
Equity Offering, Maximum Shares (in shares)			177,283
Proceeds from Issuance of Common Stock \| $												$ 903,000	$ 0
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, Remaining Availability \| $								$ 9,097,000				$ 9,097,000		$ 9,097,000
Equity Offering, Shares Issued for Commitment Fee (in shares)												22,717
ELOC [Member] \| Lincoln [Member] \| Subsequent Event [Member]
Equity Offering, Share Offerable for Sale (in shares)															1,000,000
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