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Note 4 - Investments in Non-public Companies (Detail) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 24, 2013
Feb. 26, 2012
Feb. 24, 2013
Feb. 26, 2012
May 27, 2012
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]
Feb. 24, 2013
Aesthetic Sciences [Member]
Jul. 16, 2010
Aesthetic Sciences [Member]
Feb. 15, 2011
Windset [Member]
May 31, 2012
Windset [Member]
Feb. 24, 2013
Windset [Member]
Feb. 26, 2012
Windset [Member]
Feb. 24, 2013
Windset [Member]
Feb. 26, 2012
Windset [Member]
Long-term Investments                   $ 793,000 $ 1,800,000            
Other than Temporary Impairment Losses, Investments                 1,000,000                
Investments in and Advances to Affiliates, Balance, Shares (in Shares)           150,000 201         0.201          
Cost Method Investments 793,000   793,000   793,000 [1]     15,000,000                  
Preferred Stock, Dividend Rate, Percentage                       7.50%          
Dividends and Interest Paid                         1,100,000        
Investment Income, Dividend 281,000 281,000 844,000 844,000                          
Change in Market Value Of Investment in Company                           $ 1,000,000 $ 3,600,000 $ 6,300,000 $ 4,700,000
[1] Derived from audited financial statements.