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Note 4 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Business Combination, Contingent Consideration, Liability, Total [1] $ 4,379 $ 1,343
Piazza Rosa Group [Member]    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 900  
GS Engineering [Member]    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 12,800  
Renco Electronics [Member]    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 3,500  
Business Combination, Contingent Consideration, Liability, Total $ 3,000  
[1] The fair value of our contingent consideration arrangement is determined based on our evaluation as to the probability and amount of any deferred compensation that has been earned to date.