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Note 7 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Amortization of Intangible Assets $ 2.2 $ 0.9
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 7.0  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 9.0  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 8.4  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 7.9  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 7.4  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 44.5