Note 12 - Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal									$ 2,527	$ 6,042	$ 18
State										2	(28)
Foreign									2,013	1,213	943
Foreign									4	62	(36)
Total income tax provision	$ 1,866	$ 1,408	$ 926	$ 344	$ 2,233	$ 2,103	$ 2,447	$ 536	$ 4,544	$ 7,319	$ 897