Note 12 - Income Taxes (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Tax Expense (Benefit), Total	$ 6,391,000	$ 5,631,000
Effective Income Tax Rate Reconciliation, Percent, Total	30.40%	31.10%
Employee Service Share Based Compensation Tax Charge (Benefit) from Exercise Of Stock Options	$ 23,000	$ 56,000