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Note 2 - Acquisitions - Components of Acquisition Related Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Acquisition related expenses $ 255 $ 120 $ 850 $ 1,650
Deferred Compensation Arrangements [Member]        
Acquisition related expenses 0 0 0 1,170
Other Acquisition-related Costs [Member]        
Acquisition related expenses $ 255 $ 120 $ 850 $ 480