Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details Textual)			3 Months Ended		12 Months Ended
		Feb. 27, 2017 USD ($)	Aug. 28, 2016 USD ($)	Feb. 28, 2016 USD ($)	May 28, 2017 USD ($) $ / shares shares	May 29, 2016 USD ($) $ / shares shares		May 31, 2015 USD ($) $ / shares shares		Feb. 26, 2017 USD ($)	May 29, 2015 USD ($)	Jul. 15, 2014
Number of Proprietary Platforms					2
Advertising Expense					$ 1,900,000	$ 2,100,000		$ 1,300,000
Financing Receivable, Net					1,000,000	2,300,000
Capitalized Computer Software, Additions					2.20	174,000		509,000
Goodwill					54,779,000	49,620,000	[1]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		$ 0			0	34,000,000	[2]		[2]
Deferred Tax Assets, Valuation Allowance					$ 1,325,000	$ 1,240,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares					1,428,272			371,115
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares					$ 13.58			$ 14.02
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares					$ 2.37	$ 2.85		$ 3.42
Goodwill, Impairment Loss					$ 0	$ 0		$ 0
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	[3]				423,000
Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	[3]				200,000
Reclassification of Debt Issuance Costs from Assets to Reduction in Liabilities [Member] | May 29, 2016 [Member]
Prior Period Reclassification Adjustment			$ 817,000
Reclassification of Debt Issuance Costs from Other Current Assets to Reduction in Current Portion of Long-term Debt [Member] | May 29, 2016 [Member]
Prior Period Reclassification Adjustment			175,000
Reclassification of Debt Issuance Costs from Other Noncurrent Assets to Reduction in Long-term Debt [Member] | May 29, 2016 [Member]
Prior Period Reclassification Adjustment			$ 642,000
Adjustment for Unrecognized Excess Tax Benefits [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					549,000
Adjustment for Forfeitures Treatment [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					126,000
Adjustment for Forfeitures Treatment [Member] | Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					200,000
Reclassifiction of Stock-based Compensation Excess Tax Benefits from Financing Activities to Operating Activities [Member]
Prior Period Reclassification Adjustment					150,000	$ 463,000
Outstanding Options and RSUs [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares						1.6
GreenLine Trademark [Member]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)				$ 34,000,000	$ 34,000,000
Customer Relationships [Member]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life					11 years
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life					13 years
Buildings and Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life					3 years
Buildings and Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life					40 years
Furniture and Fixtures, Computers, Capitalized Software, Capitalized Leases, Machinery, Equipment and Autos [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life					3 years
Furniture and Fixtures, Computers, Capitalized Software, Capitalized Leases, Machinery, Equipment and Autos [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life					20 years
Software Development [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life					3 years
Software Development [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life					7 years
Other Assets [Member]
Debt Issuance Costs, Line of Credit Arrangements, Net										$ 431,000
Deferred Taxes [Member] | Adjustment for Forfeitures Treatment [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 74,000
HA Based Biomaterials [Member]
Number of Product Segments					3
Goodwill						13,900,000					$ 13,900,000
Other Segments [Member]
Goodwill					$ 5,200,000	$ 4,600,000					$ 4,600,000
Biomaterials [Member]
Goodwill					13,900,000
Food Export [Member]
Goodwill					269,000
Packaged Fresh Vegetables [Member]
Goodwill					$ 35,500,000
Apio Cooling, LP [Member]
Business Acquisition, Percentage of Voting Interests Acquired					60.00%
Apio Cooling, LP [Member] | Apio [Member]
Investment Ownership Percentage					60.00%
Windset [Member]
Investment Ownership Percentage					26.90%							26.90%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]
Number of Major Customers					5
Concentration Risk, Percentage					44.00%	45.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | HA Based Biomaterials [Member] | Ophthalmic [Member]
Concentration Risk, Percentage					65.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | HA Based Biomaterials [Member] | Orthopedic [Member]
Concentration Risk, Percentage					15.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | HA Based Biomaterials [Member] | Other/Non-HA [Member]
Concentration Risk, Percentage					20.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Costco and Wal-mart [Member]
Number of Major Customers					2	2
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Costco [Member]
Concentration Risk, Percentage					18.00%	20.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Wal-mart [Member]
Concentration Risk, Percentage					14.00%	12.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | International Customers [Member]
Concentration Risk, Percentage					30.00%	31.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers					2	2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Costco [Member]
Concentration Risk, Percentage					12.00%	13.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Wal-mart [Member]
Concentration Risk, Percentage					17.00%	15.00%
Windset [Member]
Investment Ownership Percentage					26.90%
Accounts Receivable, Related Parties, Current					$ 388,000	$ 523,000
Windset [Member] | Accounts Payable, Related Parties [Member]
Accounts Payable, Related Parties					22,000	0
Windset [Member] | Cost of Sales [Member]
Revenue from Related Parties					514,000	666,000		537,000
Related Party Costs					$ 22,000	$ 32,000		$ 1,600,000

[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.

[2] See Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies for a discussion of accounting principles adopted during the period.

[3] See Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies for a discussion of accounting guidance adopted during the period.