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Note 3 - Acquisitions - Acquisition Details (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill $ 44,655 $ 6,940
Acquisitions 2016 [Member]    
Current assets 40,022  
Long-term assets 10,282  
Current liabilities (19,299)  
Long-term liabilities (556)  
Deferred Tax Liabilities (14,646)  
Redeemable non-controlling interest (10,612)  
Business acquisition total 5,191  
Note consideration (3,434)  
Cash consideration, net of cash acquired (90,852)  
Acquisition date fair value of contingent consideration (9,998)  
Total purchase consideration (104,284)  
Acquired intangible assets 54,438  
Goodwill 44,655  
Non-current assets $ 10,282  
Acquisitions 2015 [Member]    
Current assets   2,502
Long-term assets   2,000
Current liabilities   (1,689)
Long-term liabilities   (64)
Redeemable non-controlling interest   (1,696)
Business acquisition total   1,053
Cash consideration, net of cash acquired   (12,340)
Acquisition date fair value of contingent consideration   (4,544)
Total purchase consideration   (16,884)
Acquired intangible assets   8,891
Goodwill   6,940
Non-current assets   $ 2,000