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Note 15 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 01, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allocated Share-based Compensation Expense   $ 3,279 $ 4,253 $ 4,077  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price   $ 30.31 $ 28.65 $ 34.35 $ 26.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value   $ 11,305      
Share-based Compensation Arrangement by Share-based Payment Award, the Money Options, Weighted Average Remaining Contractual Life   2 years 219 days      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 3,845      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value   $ 2,998 $ 2,589 $ 3,750  
Stockholders Equity Note Spin-off Transaction Reclassification of Stock-based Compansation Liability to Shareholders Equity $ 16,622        
Stockholders Equity Note Spinoff Transaction Reclassification of Redeemable Noncontrolling Interests to Shareholders Equity 14,670        
Spin-off Stock Based Compensation Costs $ 35,400 $ 35,400  
Subordinate Voting Shares [Member]          
Stock Issued During Period Shares Spinoff Exchange of Redeemable Noncontrolling Interests and Stock Options 1,997,956        
Stock Issued During Period, Shares Spin-off Exchange of Redeemable Noncontrolling Interests and Stock Options Subject to Contractual Retention and Escrow Periods 1,187,697        
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price   $ 15.57      
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price   $ 43.57      
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   980,750