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Note 7 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Amortization of Intangible Assets, Total $ 11.6 $ 10.5 $ 8.1
Finite-Lived Intangible Asset, Expected Amortization, Year One 11.0    
Finite-Lived Intangible Asset, Expected Amortization, Year Two 10.4    
Finite-Lived Intangible Asset, Expected Amortization, Year Three 9.6    
Finite-Lived Intangible Asset, Expected Amortization, Year Four 8.7    
Finite-Lived Intangible Asset, Expected Amortization, Year Five 8.2    
Finite-Lived Intangible Asset, Expected Amortization, after Year Five $ 38.6