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Note 12 - Common Stock Warrants - Fair Value Measurements of Warrants (Details)	Sep. 30, 2025	Sep. 30, 2024
Measurement Input, Expected Term [Member] \| Minimum [Member]
Warrant measurement input	4	5
Measurement Input, Expected Term [Member] \| Maximum [Member]
Warrant measurement input	5	5
Measurement Input, Price Volatility [Member] \| Minimum [Member]
Warrant measurement input	1.263	1.186
Measurement Input, Price Volatility [Member] \| Maximum [Member]
Warrant measurement input	1.878	1.186
Measurement Input, Risk Free Interest Rate [Member] \| Minimum [Member]
Warrant measurement input	0.0371	0.045
Measurement Input, Risk Free Interest Rate [Member] \| Maximum [Member]
Warrant measurement input	0.0396	0.045
Measurement Input, Expected Dividend Rate [Member] \| Minimum [Member]
Warrant measurement input	0	0
Measurement Input, Expected Dividend Rate [Member] \| Maximum [Member]
Warrant measurement input	0	0