Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Expense (Benefit), Total	$ 2,140	$ 709	$ 7,090	$ 2,180
Effective Income Tax Rate Reconciliation, Percent, Total	17.70%	15.30%	19.90%	19.40%