Note 13 - Income Taxes - Components for the Income Tax (Expense) Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal
State		(46)	(51)
Total current provision	(590)	(99)	(148)
Deferred:
Federal	30,665		752
U.K.	(1,343)	(1,535)	2,630
State	8,554		540
Total deferred benefit (expense)	37,876	(1,535)	3,922
Income tax benefit (expense)	37,286	(1,634)	3,774
Her Majesty's Revenue and Customs (HMRC) [Member]
Current:
Foreign	(532)
National Tax Agency, Japan [Member]
Current:
Foreign	(45)	(14)	(85)
State Administration of Taxation, China [Member]
Current:
Foreign	$ (13)	$ (39)	$ (12)