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Note 6 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Amortization of Intangible Assets, Total $ 9.0 $ 5.0 $ 3.6
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 9.0    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 8.5    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 7.9    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 7.4    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 6.7    
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 38.2