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Note 9 - Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Current:        
Federal    
State    
Foreign     0.3
Total tax expense $ 0.3