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Note 10 - Common Stock Options (Details Textual) - shares
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 22,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) 6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 0 6,000