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Note 7 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Amortization of Intangible Assets, Total $ 10.5 $ 8.1 $ 4.0
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 11.7    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 11.1    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 10.4    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 9.7    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 8.7    
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 47.1