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Note 8 - Goodwill and Intangible Assets (Details Textual) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Amortization of Intangible Assets $ 3,888,000 $ 2,771,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two 16,300,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 11,500,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 9,000,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 6,100,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Six $ 3,200,000