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Note 14 - Stock Based Compensation - Schedule of Share-based Payment Award (Details) - Employee Stock Purchase Plan [Member]
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Risk-free interest rate 5.30% 5.20% 1.70%
Volatility 47.00% 57.00% 49.00%
Expected life (Month) 6 months 6 months 6 months
Dividend yield 0.00% 0.00% 0.00%