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Note 2 - Acquisitions - Components of Acquisition Related Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Acquisition related expenses $ 3,075 $ 3,749 $ 7,843
Deferred Compensation Arrangements [Member]      
Acquisition related expenses 2,810 2,810  
Acquisition-related Costs [Member]      
Acquisition related expenses $ 265 $ 939