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Note 8 - Intangible Assets (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Amortization of Intangible Assets, Total $ 2.9 $ 3.0 $ 5.8 $ 4.7
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 5.8   5.8  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 11.0   11.0  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 10.3   10.3  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 9.6   9.6  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 8.7   8.7  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five $ 46.5   $ 46.5