Note 11 - Stockholders' Equity - Warrant Valuation Assumption (Details)	Sep. 30, 2025	Sep. 30, 2024
Measurement Input, Expected Dividend Rate [Member]
Warrants measurement input	0	0
Measurement Input, Price Volatility [Member]
Warrants measurement input	0.994	0.973
Measurement Input, Risk Free Interest Rate [Member]
Warrants measurement input	0.0437
Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member]
Warrants measurement input		0.0406
Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member]
Warrants measurement input		0.0458
Measurement Input, Expected Term [Member]
Warrants measurement input	5
Measurement Input, Expected Term [Member] | Minimum [Member]
Warrants measurement input		1.5
Measurement Input, Expected Term [Member] | Maximum [Member]
Warrants measurement input		5