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Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) |  | 12 Months Ended
--- | --- | ---
Mar. 01, 2015 USD ($) | May. 31, 2015 USD ($) $ / shares shares | May. 25, 2014 USD ($) $ / shares shares | May. 26, 2013 USD ($) $ / shares shares
Customer Relationships [Member] | Minimum [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 12 years |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 13 years |  |
Minimum [Member] | Apio [Member] |  |  |  |
Notes and Advances Receivable, Term |  | 90 days |  |
Minimum [Member] | Buildings and Leasehold Improvements [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |
Minimum [Member] | Other Capitalized Property Plant and Equipment [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |
Minimum [Member] | Software Development [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |
Maximum [Member] | Apio [Member] |  |  |  |
Notes and Advances Receivable, Term |  | 270 days |  |
Maximum [Member] | Buildings and Leasehold Improvements [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |  |
Maximum [Member] | Other Capitalized Property Plant and Equipment [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 20 years |  |
Maximum [Member] | Software Development [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 7 years |  |
Apio [Member] | Apio Cooling, LP [Member] |  |  |  |
Investment Ownership Percentage |  | 60.00% |  |
Apio [Member] |  |  |  |
Notes and Advances Receivable |  | $ 0 |  |
Apio Cooling, LP [Member] |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  | $ 1,700,000 | $ 1,700,000 |
Business Acquisition, Percentage of Voting Interests Acquired |  | 60.00% |  |
Aesthetic Sciences [Member] |  |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | $ 793,000 |  |  |
Windset [Member] | Cost of Sales [Member] |  |  |  |
Revenue from Related Parties |  | $ 537,000 | 365,000 | $ 316,000
Related Party Costs |  | 1,600,000 | 1,600,000 | 2,100,000
Windset [Member] | Accounts Receivable, Related Parties [Member] |  |  |  |
Accounts Receivable, Related Parties, Current |  | 306,000 | 304,000 |
Windset [Member] | Accounts Payable, Related Parties [Member] |  |  |  |
Accounts Payable, Related Parties |  | $ 244,000 | $ 134,000 |
Windset [Member] |  |  |  |
Investment Ownership Percentage |  | 26.90% | 20.10% |
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 |  | 21.00% | 21.00% |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Wal-mart [Member] |  |  |  |
Concentration Risk, Percentage |  | 11.00% | 11.00% |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | International Customers [Member] |  |  |  |
Concentration Risk, Percentage |  | 30.00% | 29.00% |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] |  |  |  |
Number of Major Customers |  | 5 | 5 |
Concentration Risk, Percentage |  | 46.00% | 42.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Costco and Wal-mart [Member] |  |  |  |
Number of Major Customers |  |  | 2 |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Costco [Member] |  |  |  |
Concentration Risk, Percentage |  | 15.00% | 16.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Wal-mart [Member] |  |  |  |
Concentration Risk, Percentage |  | 13.00% | 12.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |
Number of Major Customers |  | 2 |  |
Product Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | HA Based Biomaterials [Member] | Ophthalmic [Member] |  |  |  |
Concentration Risk, Percentage |  | 60.00% |  |
Product Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | HA Based Biomaterials [Member] | Orthopedic [Member] |  |  |  |
Concentration Risk, Percentage |  | 20.00% |  |
HA Based Biomaterials [Member] |  |  |  |
Number of Product Segments |  | 3 |  |
Goodwill |  | $ 13,900,000 | $ 13,900,000 | 13,900,000
Food Products Technology [Member] |  |  |  |
Goodwill |  | 35,700,000 | 35,700,000 | 35,700,000
Goodwill, Impairment Loss |  | 0 | 0 | 0
Stockholders' Equity Attributable to Noncontrolling Interest |  | $ 1,677,000 | 1,692,000 |
Number of Proprietary Platforms |  | 2 |  |
Advertising Expense |  | $ 1,300,000 | 447,000 | 445,000
Accounts Receivable, Related Parties, Current |  | 306,000 | 304,000 |
Capitalized Computer Software, Additions |  | 509,000 | 913,000 | $ 0
Goodwill |  | 49,620,000 | $ 49,620,000 |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  | 793,000 |  |
Deferred Revenue |  | 843,000 | $ 1,300,000 |
Deferred Tax Assets, Valuation Allowance |  | $ 1,234,000 | $ 881,000 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  | 371,115 | 333,993 | 88,022
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares |  | $ 14.02 | $ 14.15 | $ 12.80
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  | $ 3.42 | $ 4.41 | $ 3.57

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