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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Share-Based Payment Arrangement, Expense $ 0.3 $ 0.4
Restricted Stock Units (RSUs) [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 143,500  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 13.29  
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Grants In Period, Grant Date Fair Value $ 1.9  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 4 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares) 359,215  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 3.4  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 4 years