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Note 7 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Amortization of Intangible Assets $ 0.9 $ 0.7
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2.9  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 3.6  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 3.3  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 2.8  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 2.3  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 7.4