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Note 12 - Income Taxes (Details Textual) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Expense (Benefit), Total	$ 3,619,000		$ 3,689,000	$ 9,772,000	$ 11,963,000
Effective Income Tax Rate Reconciliation, Percent, Total	29.80%		31.50%	31.00%	29.50%
Employee Service Share Based Compensation Tax Charge Benefit From Exercise Of Stock Options		$ 0	$ 38,000	$ 26,000	$ 78,000

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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