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Note 3 - Income Taxes - Summary of the Difference Between Statutory Federal Income Tax Rate and Effective Rate (Details)
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Statutory federal income tax rate 21.00% 21.00%
State franchise taxes (net of federal tax benefit) 5.00% 5.00%
Effect of state rate change on beginning balance of deferred tax liabilities (0.40%) (1.00%)
Dividends received deduction (0.50%) (1.60%)
Others (0.00%) 0.30%
Effective tax rate 25.10% 23.70%