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Note 5 - Income Taxes - Components of Income (Loss) from Operations Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income (Loss) from continuing operations $ (3,640) $ 96,975 $ (30,658)
Domestic Tax Authority [Member]      
Income (Loss) from continuing operations (7,920) 41,014 (65,895)
Foreign Tax Authority [Member]      
Income (Loss) from continuing operations $ 4,280 $ 55,961 $ 35,237