Note 5 - Intangible Assets (Details Textual) - USD ($)		12 Months Ended
	Mar. 01, 2017	May 28, 2017	May 29, 2016		May 29, 2015
Goodwill		$ 54,779,000	$ 49,620,000	[1]
Goodwill, Impaired, Accumulated Impairment Loss		38,800,000	38,800,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two		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
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months		949,000
Lifecore [Member]
Finite-Lived Customer Relationships, Gross		3,700,000
Apio [Member]
Finite-Lived Customer Relationships, Gross		7,500,000
O Olive [Member]
Goodwill	$ 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		$ 5,100,000	4,200,000
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 [Member]
Finite-Lived Intangible Asset, Useful Life		11 years
Food Products Technology [Member]
Goodwill		$ 35,500,000	35,700,000		$ 35,700,000
Biomaterials [Member]
Goodwill		13,900,000
Food Export [Member]
Goodwill		269,000
Other Segments [Member]
Goodwill		$ 5,200,000	4,600,000		4,600,000
HA Based Biomaterials [Member]
Goodwill			$ 13,900,000		$ 13,900,000

[1] Derived from audited financial statements. See Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies for discussion of accounting guidance adopted during the period.