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Note 14 - Stock-based Compensation (Details Textual) - USD ($)
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) 72,787 83,715 82,035
Restricted Stock Units (RSUs) [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 10,200,000 $ 14,800,000 $ 66,900,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 19,100,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 6 months    
Time Based Restricted Stock Units [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years    
Time Based Restricted Stock Units [Member] | Share-Based Payment Arrangement, Tranche One [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 33.33%    
Performance Based Restricted Stock Units [Member]      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 4,100,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Performance Awards, Percentage Earned if Goals Met 100.00%    
Share-Based Payment Arrangement, Plan Modification, Incremental Cost $ 1,200,000    
Performance Based Restricted Stock Units [Member] | Maximum [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Performance Awards, Percentage Earned if Goals Met 200.00%    
Employee Stock Purchase Plan [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 1,250,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 513,634    
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent 85.00%    
Equity Incentive Plan 2020 [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 2,800,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 2,500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Awards Forfeited, Expired, or Canceled under Other Plans $ 300,000