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Note 5 - Income Taxes - Changes in the Valuation Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Balance at beginning of year $ (99,602) $ (115,806) $ (32,094)
Balance at end of year (78,684) (99,602) (115,806)
Increase Due to Uncertainty of Recovery [Member]      
Valuation allowance, deferred tax asset, increase (decrease) (14,964) (2,868) (92,393)
Decrease Related to Utilization and Expiration [Member]      
Valuation allowance, deferred tax asset, increase (decrease) $ 35,882 $ 19,072 $ 8,681