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Note 23 - Quarterly Financial Information (Unaudited) (Details Textual) - 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
Income Tax Expense (Benefit), Total $ (28,329) $ 6,224 $ 32,765 $ 11,004 $ 7,356 $ 12,109 $ 8,515 $ 9,079 $ 21,664 $ 37,059 $ (16,057)
Net Income (Loss) Attributable to Parent, Total 64,620 $ 23,960 $ 8,640 $ 35,194 23,324 $ 11,959 $ 23,724 $ 29,701 132,414 88,708 120,372
Restatement Adjustment [Member]                      
Income Tax Expense (Benefit), Total 1,300       4,900       23,075 5,222 (799)
Net Income (Loss) Attributable to Parent, Total $ (1,300)       $ (4,900)       $ (23,075) $ (5,222) $ 799