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Note 6 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2017
Goodwill, Ending Balance $ 128,752 $ 128,752 $ 128,504  
Amortization of Intangible Assets, Total 3,500 3,200 500  
Asset Acquisition, Contingent Consideration Arrangement Upon Completion of Milestone     $ 5,000  
Asset Acquisitions, Contingent Consideration, Liability, Milestone Period     24 months  
Asset Acquisitions, Contingent Consideration, Liability $ 1,000 4,000    
Rapid [Member]        
Goodwill, Ending Balance     $ 99,600 $ 99,836
Business Combination, Working Capital Adjustment   $ 200    
Finite-lived Intangible Assets Acquired     $ 8,200