Note 16 - Income Taxes - Components of Income Before Taxes and Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Domestic	$ 50,181	$ 48,608	$ 63,232
Foreign	689	(354)	(1,727)
Income before income taxes	50,870	48,254	61,505
Federal	14,982	14,572	18,301
State	3,265	3,635	3,895
Foreign	302	249	192
	18,549	18,456	22,388
Federal	(70)	(370)	1,153
State	(84)	(33)	122
Foreign	(72)	(557)	(477)
	(226)	(960)	798
Total provision	$ 18,323	$ 17,496	$ 23,186