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Note 9 - Redeemable Non-controlling Interests (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 102,352 $ 77,559 $ 80,926
Subordinate Non-controlling Interest Shares 2,200,000    
Potential Increase Decrease to Dilutive Earnings Per Share Put or Call Options Settled with Subordinate Voting Shares $ 0.48    
Redemption Amount [Member]      
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 100,569 $ 76,332