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Note 4 - Intangible Assets (Details Textual) - USD ($)
 12 Months Ended
May. 31, 2015
May. 25, 2014
May. 26, 2013
Food Products Technology [Member]      
Goodwill $ 35,700,000 $ 35,700,000 $ 35,700,000
HA Based Biomaterials [Member]      
Goodwill 13,900,000 13,900,000 $ 13,900,000
Trademarks and Trade Names [Member]      
Finite-Lived Intangible Assets, Accumulated Amortization $ 872,000 872,000  
Customer Relationships [Member] | Lifecore [Member]      
Finite-Lived Intangible Asset, Useful Life 12 years    
Customer Relationships [Member] | Apio [Member]      
Finite-Lived Intangible Asset, Useful Life 13 years    
Customer Relationships [Member]      
Finite-Lived Intangible Assets, Accumulated Amortization $ 3,400,000 2,500,000  
Lifecore [Member]      
Finite-Lived Customer Relationships, Gross 3,700,000    
Apio [Member]      
Finite-Lived Customer Relationships, Gross 7,500,000    
Goodwill 49,620,000 49,620,000  
Goodwill, Impaired, Accumulated Impairment Loss 4,800,000 $ 4,800,000  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 885,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 885,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 885,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 885,000    
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year $ 885,000