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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, 2025
Sep. 30, 2024
Sep. 30, 2023
Risk-free interest rate 4.60% 5.30% 5.20%
Volatility 41.00% 47.00% 57.00%
Expected life (Month) 6 months 6 months 6 months