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Note 5 - Investments in non-public companies (Detail) (USD $)
1 Months Ended 3 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended
May 31, 2012
Aug. 26, 2012
Aug. 28, 2011
May 27, 2012
Feb. 15, 2011
Feb. 15, 2011
Preferred Stock [Member]
Windset [Member]
Feb. 15, 2011
Common Stock [Member]
Windset [Member]
Apio [Member]
Feb. 15, 2011
Common Stock [Member]
Windset [Member]
May 30, 2010
Aesthetic Sciences [Member]
Aug. 26, 2012
Aesthetic Sciences [Member]
Jul. 16, 2010
Aesthetic Sciences [Member]
Feb. 15, 2011
Windset [Member]
Aug. 28, 2011
Windset [Member]
Long-term Investments                   $ 793,000 $ 1,800,000    
Other than Temporary Impairment Losses, Investments   1,000,000             1,000,000        
Investments in and Advances to Affiliates, Balance, Shares (in Shares)         201 150,000           0.201  
Cost Method Investments   793,000   793,000       15,000,000          
Common Stock, Value, Issued   26,000   26,000     201            
Preferred Stock, Dividend Rate, Percentage                       7.50%  
Dividends and Interest Paid 1,100,000                        
Investment Income, Dividend   281,000 281,000                    
Change in Market Value Of Investment in Company   $ 4,300,000                     $ 52,000