Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Tax Expense (Benefit), Total	$ 1,250	$ 600
Effective Income Tax Rate Reconciliation, Percent, Total	27.10%	20.20%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	3.70%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	0.90%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent, Total	1.60%