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Note 4 - Investments in Non-public Companies (Details) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 23, 2014
Feb. 24, 2013
Feb. 23, 2014
Feb. 23, 2014
Feb. 24, 2013
Feb. 15, 2011
Preferred Stock [Member]
Windset [Member]
Feb. 15, 2011
Common Stock [Member]
Apio [Member]
Windset [Member]
Feb. 15, 2011
Common Stock [Member]
Windset [Member]
May 30, 2010
Aesthetic Sciences [Member]
May 26, 2013
Aesthetic Sciences [Member]
Feb. 23, 2013
Aesthetic Sciences [Member]
Jul. 16, 2010
Aesthetic Sciences [Member]
Feb. 15, 2011
Windset [Member]
May 31, 2013
Windset [Member]
May 31, 2012
Windset [Member]
Feb. 23, 2014
Windset [Member]
Feb. 24, 2013
Windset [Member]
Feb. 23, 2014
Windset [Member]
Feb. 24, 2013
Windset [Member]
Note 4 - Investments in Non-public Companies (Details) [Line Items]                                      
Long-term Investments                   $ 793,000 $ 793,000 $ 1,800,000              
Other than Temporary Impairment Losses, Investments                 1,000,000                    
Investment in Non-Public Company Shares (in Shares)           150,000 201                        
Payments to Acquire Investments             201 15,000,000                      
Investment Ownership Percentage                         20.10%            
Preferred Stock, Dividend Rate, Percentage                         7.50%            
Dividends and Interest Paid                           1.1 1,100,000        
Investment Income, Dividend 281,000 281,000 844,000 844,000 844,000                            
Change in Market Value Of Investment in Company                               $ 400,000 $ 1,000,000 $ 8,100,000 $ 6,300,000