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Note 2 - Acquisitions - Components of Acquisition Related Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Acquisition related costs $ 773 $ 859 $ 1,507 $ 1,547
Deferred Compensation Arrangements [Member]        
Acquisition related costs 467 703 1,170 1,370
Other Acquisition-related Costs [Member]        
Acquisition related costs $ 306 $ 156 $ 337 $ 177