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Note 10 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Share-Based Payment Arrangement, Expense $ 0.3 $ 0.3 $ 1.2 $ 1.0
Restricted Stock Units (RSUs) [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     194,700  
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)     $ 12.09  
Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Grants In Period, Grant Date Fair Value     $ 2.4  
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) 350,318   350,318  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 2.4   $ 2.4  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     4 years