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Note 8 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions	Nov. 13, 2025	Nov. 12, 2025	Sep. 30, 2025	Aug. 31, 2025
Series F Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 0.55	$ 0.55
Subsequent Event [Member] \| Series F Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.4349
Subsequent Event [Member] \| The 2025 ATM Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)	736,549
Proceeds from Issuance of Common Stock	$ 0.4
Subsequent Event [Member] \| The 2025 ATM Agreement [Member] \| Minimum [Member]
Shares Issued, Price Per Share (in dollars per share)	$ 0.4349
Subsequent Event [Member] \| The 2025 ATM Agreement [Member] \| Maximum [Member]
Shares Issued, Price Per Share (in dollars per share)	$ 0.5601
Subsequent Event [Member] \| The 2024/2025 Compensation Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		2,605,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)		$ 0.49
Subsequent Event [Member] \| The 2024/2025 Compensation Plan [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)		10 years
Subsequent Event [Member] \| The 2024/2025 Compensation Plan [Member] \| Performance-based Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares)		1,550,000