Note 8 - Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal									$ 148		$ (7)
State									71	16	23
International									511	131	218
Total Current									730	147	234
Deferred:
Federal									(17,393)	(24)	33
State									(1,348)	(2)
International									(22)	22	(55)
Total deferred tax benefit									(18,763)	(4)	(22)
Total tax expense (benefit)	$ (18,199)	$ 225	$ 59	$ (118)	$ 28	$ 61	$ 30	$ 24	$ (18,033)	$ 143	$ 212