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Note 2 - Acquisitions - Components of Acquisition Related Costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Acquisition related expenses $ 734 $ 688
Deferred Compensation Arrangements [Member]    
Acquisition related expenses 703 667
Other Acquisition-related Costs [Member]    
Acquisition related expenses $ 31 $ 21