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Note 5 - Stockholders' Equity - Stock-based Compensation Activity (Details) - $ / shares
 12 Months Ended
May. 31, 2015
May. 25, 2014
May. 26, 2013
Restricted Stock [Member]      
Balance (in shares) 149,300 95,330 348,166
Balance (in dollars per share) $ 13.17 $ 6.52 $ 5.93
Granted (in shares) 324,357 128,631 6,666
Granted (in dollars per share) $ 13.97 $ 14.30 $ 9.01
Awarded/Exercised (in shares) (79,219) (62,499) (231,086)
Awarded/Exercised (in dollars per share) $ 11.57 $ 6.18 $ 5.74
Forfeited (in shares) (1,667) (12,162) (28,416)
Forfeited (in dollars per share) $ 14.30 $ 8.86 $ 6.20
Balance (in shares) 392,771 149,300 95,330
Balance (in dollars per share) $ 14.15 $ 13.17 $ 6.52
Awarded/Exercised (in dollars per share) 11.57 6.18 5.74
Forfeited (in dollars per share) $ 14.30 $ 8.86 6.20
Plan shares expired (in shares)      
Granted (in dollars per share) $ 13.97 $ 14.30 $ 9.01
Plan shares expired (in shares)      
Employee Stock Option [Member]      
Balance (in shares) 1,215,860 1,339,892 2,046,432
Balance (in dollars per share) $ 8.45 $ 6.58 $ 6.50
Granted (in shares) 794,500 291,500 20,000
Granted (in dollars per share) $ 14.20 $ 14.30 $ 9.01
Awarded/Exercised (in shares) (205,419) (398,080) (671,563)
Awarded/Exercised (in dollars per share) $ 6.55 $ 6.45 $ 6.30
Forfeited (in shares) (2,223) (12,452) (44,977)
Forfeited (in dollars per share) $ 14.30 $ 6.66 $ 6.34
Plan shares expired (in shares) (66,000) (5,000) (10,000)
Plan shares expired (in dollars per share) $ 11.32 $ 13.32 $ 13.32
Balance (in shares) 1,736,718 1,215,860 1,339,892
Balance (in dollars per share) $ 11.19 $ 8.45 $ 6.58
Balance (in shares) 2,000,000 422,977 449,643
Balance (in dollars per share) $ 14.15 $ 12.80  
Granted (in shares) (1,118,857) (420,131) (26,666)
Awarded/Exercised (in shares) 0 0  
Balance (in shares) 881,143 2,000,000 422,977
Balance (in dollars per share) $ 14.02 $ 14.15 $ 12.80
Additional shares reserved (in shares)   2,000,000  
Plan shares expired (in shares)   (2,846)