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Note 8 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Amortization of Intangible Assets, Total $ 2.8 $ 1.9 $ 7.6 $ 6.0
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2.9   2.9  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 11.0   11.0  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 10.3   10.3  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 9.7   9.7  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 8.9   8.9  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 50.3   $ 50.3