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Note 3 - Acquisition (Details Textual) - USD ($)
$ in Thousands
May 24, 2017
Mar. 31, 2018
Dec. 31, 2017
Business Combination, Contingent Consideration, Liability, Current   $ 5,833 $ 5,355
Business Combination, Contingent Consideration, Liability, Noncurrent   6,992 $ 5,744
Ambrell [Member]      
Payments to Acquire Businesses, Gross $ 22,610    
Business Acquisition, Transaction Costs 935    
Business Combination, Consideration Transferred, Total 26,733    
Business Combination, Contingent Consideration, Liability, Current   5,833  
Business Combination, Contingent Consideration, Liability, Noncurrent 4,123 $ 6,992  
Ambrell [Member] | Aggregate Total Payout [Member]      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 18,000