Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Expense (Benefit), Total	$ 2,750	$ 1,250
Effective Income Tax Rate Reconciliation, Percent, Total	20.80%	27.10%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	(4.10%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	(1.90%)