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Note 8 - Stockholders' Equity - Valuation Assumptions for Stock Options (Details) - Share-Based Payment Arrangement, Option [Member] - $ / shares
Rate in Thousands
3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dividend yield 0.00%  
Director [Member]    
Weighted-average fair value per share option (in dollars per share) $ 1.12  
Expected life (in years) (Year) 6 years  
Volatility 108.50%  
Risk-free interest rate 3.80%  
Dividend yield 0.00%  
Non-Board of Directors [Member]    
Weighted-average fair value per share option (in dollars per share)   $ 2.96
Expected life (in years) (Year)   6 years
Volatility   90.80%
Risk-free interest rate   1.10%
Dividend yield   0.00%