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Note 7 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Amortization of Intangible Assets $ 0.8 $ 0.7 $ 1.6 $ 1.4
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2.0   2.0  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 3.6   3.6  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 3.4   3.4  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 3.1   3.1  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 2.6   2.6  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 8.9   $ 8.9