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Note 2 - Acquisitions - Components of Acquisition Related Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Acquisition related expenses $ 1,759 $ 3,075 $ 3,749
Deferred Compensation Arrangements [Member]      
Acquisition related expenses 1,170 2,810  
Acquisition-related Costs [Member]      
Acquisition related expenses $ 589 $ 265