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Note 8 - Summary of Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Trade Names [Member]    
Finite lived intangible assets, Useful life 7 years  
Finite lived intangible assets, Cost $ 43,252 $ 8,775
Finite lived intangible assets, Accumulated Amortization (10,516) $ (8,775)
Finite lived intangible assets, Amortized Cost $ 32,736
Customer Lists [Member]    
Finite lived intangible assets, Useful life 9 years  
Finite lived intangible assets, Cost $ 314,600 $ 304,180
Finite lived intangible assets, Accumulated Amortization (275,287) (263,178)
Finite lived intangible assets, Amortized Cost $ 39,313 41,002
Patents [Member]    
Finite lived intangible assets, Useful life 14 years  
Finite lived intangible assets, Cost $ 126,491 121,341
Finite lived intangible assets, Accumulated Amortization (72,719) (64,447)
Finite lived intangible assets, Amortized Cost $ 53,772 56,894
Unpatented Technology [Member]    
Finite lived intangible assets, Useful life 15 years  
Finite lived intangible assets, Cost $ 13,169 13,169
Finite lived intangible assets, Accumulated Amortization (11,628) (10,435)
Finite lived intangible assets, Amortized Cost $ 1,541 2,734
Computer Software, Intangible Asset [Member]    
Finite lived intangible assets, Useful life 9 years  
Finite lived intangible assets, Cost $ 1,046 1,046
Finite lived intangible assets, Accumulated Amortization (1,042) (1,037)
Finite lived intangible assets, Amortized Cost $ 4 9
Noncompete Agreements [Member]    
Finite lived intangible assets, Useful life 9 years  
Finite lived intangible assets, Cost $ 1,731 1,961
Finite lived intangible assets, Accumulated Amortization (508) (406)
Finite lived intangible assets, Amortized Cost 1,223 1,555
Finite lived intangible assets, Cost 500,289 450,472
Finite lived intangible assets, Accumulated Amortization (371,700) (348,278)
Finite lived intangible assets, Amortized Cost 128,589 102,194
Indefinite-lived tradenames 128,321 182,684
Total intangible assets 628,610 633,156
Finite lived intangible assets, Amortized Cost, Excluding Goodwill $ 256,910 $ 284,878