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Note 4 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Payment for Contingent Consideration Liability, Financing Activities $ 1,167 $ (0)
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 2,200  
Payment for Contingent Consideration Liability, Financing Activities $ 1,200