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Note 8 - Stockholders' Equity - Valuation Assumptions for Stock Options (Details) - Share-Based Payment Arrangement, Option [Member]
Rate in Thousands
3 Months Ended
Dec. 31, 2023
Rate
Dividend yield 0.00%
Non-Board of Directors [Member]  
Volatility 108.50%
Risk-free interest rate 3.80%
Dividend yield 0.00%