Note 11 - Income Taxes - Income Tax Expense Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 12,979	$ 14,797	$ 13,383
State	3,514	2,669	3,151
Foreign	1,932	1,475	3,563
Total current	18,425	18,941	20,097
Deferred:
Federal	8,872	4,562	3,264
State	1,222	512	399
Foreign	(596)	216	360
Total deferred	9,498	5,290	4,023
Income Tax Expense	$ 27,923	$ 24,231	$ 24,120