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Note 7 - Debt (Details Textual)
$ in Millions
12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Line of Credit Facility, Remaining Borrowing Capacity $ 193.4    
Extraordinary and Certain Other Defined Items Excluded from Adjusted EBIT $ 7.5    
Interest Coverage Ratio, Actual 22.37    
Leverage Ratio, Actual 1.79    
Long-term Line of Credit $ 192.5    
Line of Credit Facility, Interest Rate at Period End 2.41%    
Interest Rate Swap [Member]      
Derivative, Notional Amount $ 100.0    
Derivative, Average Fixed Interest Rate 1.60%    
Minimum [Member]      
Interest Coverage Ratio, Requirement 3    
Maximum [Member]      
Leverage Ratio, Requirement 3.5    
Amended and Restated Credit Agreement [Member]      
Line Of Credit, Accordion Feature   $ 100.0  
Debt Instrument, Term   5 years  
Line of Credit Facility, Maximum Borrowing Capacity   $ 400.0  
Swing Line Loan [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   10.0  
Letter of Credit [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   30.0  
Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 225.0  
Standby Letters of Credit [Member]      
Long-term Line of Credit $ 8.9   $ 7.7