Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Income Tax Expense (Benefit), Total	$ 3,895	$ 4,150
Effective Income Tax Rate Reconciliation, Percent, Total	21.80%	21.10%
Effective Income Tax Rate Continuing Operations Increase (Decrease) During the Period	0.70%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Unrecognized Tax Benefits, Ending Balance	$ 4,600		$ 4,600