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Note 10 - Income Taxes (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Effective Income Tax Rate Reconciliation, Percent, Total 26.10% 26.70% 23.90% 28.80%