Note 18 - Income taxes - The Federal and State Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current	$ 21,202	$ 15,161	$ 9,534
Deferred	(6,477)	(1,606)	(2,792)
Total Federal Tax	14,725	13,555	6,742
Current	4,580	2,644	2,188
Deferred	(938)	(38)	(621)
Total State Tax	3,642	2,606	1,567
Current	266	523	(616)
Deferred	(1,597)	(2,101)	596
Total Foreign Tax	(1,331)	(1,578)	(20)
Provision for income taxes	$ 17,036	$ 14,583	$ 8,289