Note 5 - Intangible Assets (Details Textual) - USD ($)		12 Months Ended
	Mar. 01, 2017	May 27, 2018	May 28, 2017	May 29, 2016
Goodwill, Ending Balance		$ 54,510,000	$ 54,510,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two		949,000
Goodwill, Impaired, Accumulated Impairment Loss		38,800,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months		949,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three		949,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four		949,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five		949,000
Lifecore [Member]
Finite-Lived Customer Relationships, Gross		3,700,000
Apio [Member]
Finite-Lived Customer Relationships, Gross		7,500,000
O Olive & Vinegar [Member]
Goodwill, Ending Balance	$ 5,200,000
Finite-Lived Customer Relationships, Gross		700,000
Finite-Lived Intangible Asset, Useful Life	11 years
Trade Names [Member]
Finite-Lived Intangible Assets, Accumulated Amortization		872,000	872,000
Customer Relationships [Member]
Finite-Lived Intangible Assets, Accumulated Amortization		$ 6,100,000	5,100,000
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] | O Olive & Vinegar [Member]
Finite-Lived Intangible Asset, Useful Life		11 years
Food Export [Member]
Goodwill, Ending Balance		$ 35,400,000	35,400,000	$ 35,400,000
Biomaterials [Member]
Goodwill, Ending Balance		13,900,000	13,900,000	13,900,000
Other Segments [Member]
Goodwill, Ending Balance		$ 5,200,000	$ 5,200,000	$ 5,200,000