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Note 3 - Acquisition (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended
May 24, 2017
Apr. 30, 2018
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Business Combination, Contingent Consideration, Liability, Current     $ 5,355 $ 5,355 $ 12,167 $ 5,355
Business Combination, Contingent Consideration, Liability, Noncurrent     5,744 5,744 5,744
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability and Earnout Payable         6,901 $ 6,976
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 Arrangements, Payment of Earnout for Prior Year Acquisition   $ 5,833        
Business Combination, Contingent Consideration, Liability, Noncurrent 4,123          
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual       13,562 26,446  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual       (6,238) (5,162)  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability and Earnout Payable     $ 6,976 $ 6,976 6,901  
Ambrell [Member] | Aggregate Total Payout [Member]            
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 18,000          
Ambrell [Member] | Second Earn Out [Member]            
Business Combination, Contingent Consideration, Liability, Current         $ 12,167  
Ambrell [Member] | Maximum [Member]            
Business Combination, Liabilities Arising from Contingencies, Amount Recognized $ 18,000