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Note 8 - Stockholders' Equity (Details) - Stock-based Compensation Activity (USD $)
 12 Months Ended
May 25, 2014
May 26, 2013
May 27, 2012
Note 8 - Stockholders' Equity (Details) - Stock-based Compensation Activity [Line Items]      
RSUs and options available for grant 422,977 449,643 640,976
Weighted average exercise price (in Dollars per share) $ 12.80 $ 6.72  
Additional shares reserved 2,000,000    
RSUs and options, granted (420,131) (26,666) (191,333)
RSUs and options, plan shares expired (2,846)    
RSUs and options available for grant 2,000,000 422,977 449,643
Weighted average exercise price (in Dollars per share) $ 14.15 $ 12.80 $ 6.72
Restricted Stock [Member]
      
Note 8 - Stockholders' Equity (Details) - Stock-based Compensation Activity [Line Items]      
Restricted shares outstanding 95,330 348,166 415,085
Weighted average grant date fair value (in Dollars per share) $ 6.52 $ 5.93 $ 5.96
Restricted shares, granted 128,631 6,666 47,833
Weighted average grant date fair value, granted (in Dollars per share) $ 14.30 $ 9.01 $ 6.67
Restricted shares, awarded/exercised (62,499) (231,086) (111,252)
Weighted average grant date fair value, awarded/exercised (in Dollars per share) $ 6.18 $ 5.74 $ 6.36
Restricted shares, forfeited (12,162) (28,416) (3,500)
Weighted average grant date fair value, forfeited (in Dollars per share) $ 8.86 $ 6.20 $ 5.84
Restricted shares outstanding 149,300 95,330 348,166
Weighted average grant date fair value (in Dollars per share) $ 13.17 $ 6.52 $ 5.93
Employee Stock Option [Member]
      
Note 8 - Stockholders' Equity (Details) - Stock-based Compensation Activity [Line Items]      
Stock options outstanding 1,339,892 2,046,432 2,318,753
Weighted average exercise price (in Dollars per share) $ 6.58 $ 6.50 $ 6.34
Stock options, granted 291,500 20,000 143,500
Weighted average exercise price, granted (in Dollars per share) $ 14.30 $ 9.01 $ 6.67
Stock options, awarded/exercised (398,080) (671,563) (371,727)
Weighted average exercise price, awarded/exercised (in Dollars per share) $ 6.45 $ 6.30 $ 5.40
Stock options, forfeited (12,452) (44,977) (5,657)
Weighted average exercise price, forfeited (in Dollars per share) $ 6.66 $ 6.34 $ 5.76
Stock options, plan shares expired (5,000) (10,000) (38,437)
Weighted average exercise price, plan shares expired (in Dollars per share) $ 13.32 $ 13.32 $ 8.23
Stock options outstanding 1,215,860 1,339,892 2,046,432
Weighted average exercise price (in Dollars per share) $ 8.45 $ 6.58 $ 6.50