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Note 13 - Stock-based compensation and purchase plans (Details) (USD $)
 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Note 13 - Stock-based compensation and purchase plans (Details) [Line Items]      
$ 3,343,000 $ 3,768,000 $ 3,805,000
Deferred Tax Expense from Stock Options Exercised 1,200,000 1,300,000 1,300,000
Common Stock, Capital Shares Reserved for Future Issuance (in Shares) 565,200    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) 44,388    
Total intrinsic value, exercised/vested 3,525,711    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in Shares) 172,490 207,989  
Restricted Stock Awards [Member] | Executive Compensation Program [Member]
      
Note 13 - Stock-based compensation and purchase plans (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 55.61 $ 40.78 $ 29.36
Restricted Stock Awards [Member]
      
Note 13 - Stock-based compensation and purchase plans (Details) [Line Items]      
1,500,000 1,400,000 1,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) 44,388 52,884 62,817
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 44.59 $ 29.05 $ 24.22
Total intrinsic value, exercised/vested 3,500,000 2,400,000 1,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 2,000,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 350 days    
Performance Stock Units [Member] | Executive Compensation Program [Member]
      
Note 13 - Stock-based compensation and purchase plans (Details) [Line Items]      
1,300,000 2,100,000 2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 44.20 $ 26.60 $ 23.49
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 600,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 87 days    
Performance Stock Units [Member]
      
Note 13 - Stock-based compensation and purchase plans (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) 15,337    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in Shares) 41,004 86,220  
Executive Compensation Program [Member]
      
Note 13 - Stock-based compensation and purchase plans (Details) [Line Items]      
600,000 400,000 400,000
Total intrinsic value, exercised/vested 3,100,000 5,400,000 2,500,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 700,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 43 days    
Percent of participants annual incentive compensation required to defer 20.00%    
Percent of participants annual incentive compensation participants may elect to defer, maximum 50.00%    
Expiration of restrictions on units 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in Shares) 105,967 94,916  
Executive Compensation Program [Member] | Minimum [Member]
      
Note 13 - Stock-based compensation and purchase plans (Details) [Line Items]      
Shares of common stock iIssued determined by adjustment of target range, percent 50.00%    
Executive Compensation Program [Member] | Maximum [Member]
      
Note 13 - Stock-based compensation and purchase plans (Details) [Line Items]      
Shares of common stock iIssued determined by adjustment of target range, percent 200.00%    
Employee Stock Purchase Plan [Member]
      
Note 13 - Stock-based compensation and purchase plans (Details) [Line Items]      
Percent of fair market value at which employees may purchase shares of stock 95.00%    
Stock reserved for employee stock purchase plan (in Shares) 102,363    
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares) 5,813 9,185 12,044
Stock issued during period average price (in Dollars per share) $ 48.16 $ 34.48 $ 28.32