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Note 10 - Income Taxes (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Effective Income Tax Rate Reconciliation, Percent, Total 27.90% 26.60% 26.10% 27.70%