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Note 2 - Restatement of Previously Reported Consolidated Financial Statements (Detail) - Consolidated Statements of Income (USD $)
 3 Months Ended
Aug. 26, 2012
Aug. 28, 2011
Aug. 28, 2011
Operating income $ 3,003,000 $ 2,873,000  
Dividend income 281,000 281,000  
Interest income 26,000 76,000  
Interest expense (541,000) (176,000)  
Other income 4,259,000 9,000  
Net income before taxes 7,028,000 3,063,000  
Income tax expense (2,565,000) (1,110,000)  
Consolidated net income 4,463,000 1,953,000  
Non controlling interest (97,000) (141,000)  
Net income applicable to Common Stockholders 4,366,000 1,812,000 1,812,000
Basic net income per share (in Dollars per share) $ 0.17 $ 0.07  
Diluted net income per share (in Dollars per share) $ 0.17 $ 0.07 $ 0.07
Previously Reported [Member]
      
Operating income 3,003,000    
Dividend income 281,000    
Interest income 26,000    
Interest expense (541,000)    
Other income 1,359,000    
Net income before taxes 4,128,000    
Income tax expense (1,492,000)    
Consolidated net income 2,636,000    
Non controlling interest (97,000)    
Net income applicable to Common Stockholders 2,539,000    
Basic net income per share (in Dollars per share) $ 0.10    
Diluted net income per share (in Dollars per share) $ 0.10    
Adjustment [Member]
      
Other income 2,900,000    
Net income before taxes 2,900,000    
Income tax expense (1,073,000)    
Consolidated net income 1,827,000    
Net income applicable to Common Stockholders 1,827,000    
Basic net income per share (in Dollars per share) $ 0.07    
Diluted net income per share (in Dollars per share) $ 0.07    
Restatement [Member]
      
Operating income 3,003,000    
Dividend income 281,000    
Interest income 26,000    
Interest expense (541,000)    
Other income 4,259,000    
Net income before taxes 7,028,000    
Income tax expense (2,565,000)    
Consolidated net income 4,463,000    
Non controlling interest (97,000)    
Net income applicable to Common Stockholders $ 4,366,000    
Basic net income per share (in Dollars per share) $ 0.17    
Diluted net income per share (in Dollars per share) $ 0.17