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Note 11 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]        
Income tax provision at U.S federal statutory rate   $ 23,059 $ 49,639 $ 44,638
State and local taxes, net of federal income tax benefit   (2,539) (207) (2,310)
Effect of foreign income taxed at rates other than the U.S. federal statutory rate   44 (1,989) (1,154)
Tax credits   (280) (100) (200)
Net change in valuation allowance   476 (315) 1,673
Domestic production deduction     (3,347) (2,327)
Share-based payment compensation   (3,722) (5,236)  
Tax reform and changes in tax laws $ 117 (1,939) 117  
Permanent items and other   1,497 (501) (106)
Total income tax expense   $ 16,596 $ 38,061 $ 40,214