Note 1 - Basis of Presentation and Significant Accounting Policies - Financial Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Derivative liability	$ 0	$ 0
Fair Value, Inputs, Level 1 [Member]
Derivative liability	0	0
Fair Value, Inputs, Level 2 [Member]
Derivative liability	0	0
Fair Value, Inputs, Level 3 [Member]
Derivative liability	$ 0	$ 0