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Note 8 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Amortization of Intangible Assets, Total $ 3.0 $ 2.2 $ 4.7 $ 4.2
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 5.7   5.7  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 10.9   10.9  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 10.2   10.2  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 9.6   9.6  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 8.8   8.8  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 50.3   $ 50.3