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Note 7 - Debt (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 12 Months Ended
Jan. 04, 2012
Jun. 30, 2013
Jun. 30, 2013
Sub-Facility [Member]
Jun. 30, 2011
Industrial Revenue Bonds [Member]
Jun. 30, 2013
Standby Letters of Credit [Member]
Jun. 30, 2012
Standby Letters of Credit [Member]
Note 7 - Debt (Details) [Line Items]            
Debt Instrument, Term 5 years 5 years        
Line of Credit Facility, Maximum Borrowing Capacity $ 150 $ 225 $ 30      
Line Of Credit Accordion Feature   100        
Line of Credit Facility, Expiration Date Sep. 30, 2012 Jan. 31, 2017        
Leverage Ratio Requirement   3.5        
Interest Coverage Ratio Requirement   3        
Line of Credit Facility, Remaining Borrowing Capacity   164.2        
Extraordinary And Certain Other Defined Items Excluded From Adjusted EBIT   2.0        
Interest Coverage Ratio Actual   27.48        
Leverage Ratio Actual   0.73        
Short-term Debt       3.3    
Line of Credit Facility, Amount Outstanding         $ 10.7 $ 9.5