Note 11 - Income Taxes (Details) - Components of Income Tax Provision - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal									$ 6,042	$ 18	$ 77
State									2	(28)	67
Foreign									1,213	943	1,053
Deferred:
Foreign									62	(36)	(88)
Total income tax provision	$ 2,233	$ 2,103	$ 2,447	$ 536	$ 712	$ (573)	$ 502	$ 257	$ 7,319	$ 897	$ 1,109