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Note 8 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Amortization of Intangible Assets, Total $ 1.9 $ 1.9
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 7.6  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 9.6  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 9.3  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 8.9  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 8.3  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 45.7