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Note 7 - Debt (Details)
$ in Thousands
 12 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Note 7 - Debt (Details) [Line Items]    
Line of Credit Facility, Expiration Date 2 January 2017  
Line of Credit Facility, Remaining Borrowing Capacity $ 248,300  
Extraordinary and Certain Other Defined Items Excluded from Adjusted EBIT $ 7,500  
Interest Coverage Ratio Actual 26.99  
Leverage Ratio Actual 1.08  
Long-term Line of Credit $ 103,000 $ 45,000
Line of Credit Facility, Interest Rate at Period End 1.46%  
Interest Rate Swap [Member]    
Note 7 - Debt (Details) [Line Items]    
Derivative, Notional Amount $ 35,000  
Derivative, Average Fixed Interest Rate 1.63%  
Amended and Restated Credit Agreement [Member]    
Note 7 - Debt (Details) [Line Items]    
Debt Instrument, Term 5 years  
Line of Credit Facility, Maximum Borrowing Capacity $ 400,000  
Line Of Credit Accordion Feature 100,000  
Swing Line Loan [Member]    
Note 7 - Debt (Details) [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 10,000  
Letter of Credit [Member]    
Note 7 - Debt (Details) [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 30,000  
Revolving Credit Facility [Member]    
Note 7 - Debt (Details) [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 225,000  
Standby Letters of Credit [Member]    
Note 7 - Debt (Details) [Line Items]    
Long-term Line of Credit $ 7,200 $ 11,300
Minimum [Member]    
Note 7 - Debt (Details) [Line Items]    
Interest Coverage Ratio Requirement 3.0  
Maximum [Member]    
Note 7 - Debt (Details) [Line Items]    
Leverage Ratio Requirement 3.5