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Note 7 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Amortization of Intangible Assets $ 1.1 $ 0.8 $ 2.0 $ 1.6
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2.2   2.2  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 4.6   4.6  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 4.6   4.6  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 4.1   4.1  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 3.6   3.6  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 17.8   $ 17.8