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Note 9 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Income Tax Expense (Benefit), Total $ 935,000 $ 190,000 $ 1,619,000 $ 313,000
Effective Income Tax Rate Reconciliation, Percent, Total 20.40% 20.30% 19.20% 20.00%
Unrecognized Tax Benefits, Ending Balance $ 0   $ 0