Note 14 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Expense (Benefit), Total	$ 1,655	$ 2,908	$ 531	$ 3,529
Effective Income Tax Rate Reconciliation, Percent, Total	7.40%	10.70%	1.10%	7.10%
GILTI Income	$ 10,100	$ 15,500	$ 25,600	$ 27,900