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Note 6 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Amortization of Intangible Assets, Total $ 2.2 $ 1.1 $ 6.7 $ 3.1
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2.4   2.4  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 9.2   9.2  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 8.7   8.7  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 8.1   8.1  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 7.6   7.6  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 46.5   $ 46.5