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Note 5 - Business Combinations - Allocation of Purchase Price for the Acquisition of Rapid (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 30, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets acquired:          
Goodwill, Ending Balance   $ 128,504 $ 128,752 $ 128,504 $ 28,916
Liabilities assumed:          
Net cash consideration     $ 90 110,533
Rapid [Member]          
Assets acquired:          
Current assets   6,720   6,720  
Goodwill, Ending Balance $ 99,800 99,836   99,836  
Other intangible assets   8,700   8,700  
Other long-term assets   8,855   8,855  
Total assets acquired   124,111   124,111  
Liabilities assumed:          
Current liabilities   2,067   2,067  
Other long-term liabilities   85   85  
Total liabilities assumed   2,152   2,152  
Net assets acquired   121,959   $ 121,959  
Cash paid   115,378      
Cash acquired   (4,755)      
Net cash consideration 110,600 110,623      
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 11,300 11,336      
Total purchase consideration $ 121,900 $ 121,959