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Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2016 USD ($) | May 29, 2016 USD ($) $ / shares shares | May 31, 2015 USD ($) $ / shares shares | May 25, 2014 USD ($) $ / shares shares | May 31, 2016 USD ($) | Jul. 15, 2014
Apio [Member] |  |  |  |  |  |
Due from Related Parties |  | $ 0 |  |  |  |
Windset [Member] | Cost of Sales [Member] |  |  |  |  |  |
Revenue from Related Parties |  | 666,000 | $ 537,000 | $ 365,000 |  |
Related Party Costs |  | 32,000 | 1,600,000 | 1,600,000 |  |
Windset [Member] | Accounts Payable, Related Parties [Member] |  |  |  |  |  |
Accounts Payable, Related Parties |  | $ 0 | 244,000 |  |  |
Windset [Member] |  |  |  |  |  |
Investment Ownership Percentage |  | 26.90% |  |  |  |
Accounts Receivable, Related Parties, Current |  | $ 523,000 | $ 306,000 |  |  |
Windset [Member] |  |  |  |  |  |
Investment Ownership Percentage |  | 26.90% | 26.90% |  |  | 26.90%
Investments, Fair Value Disclosure |  | $ 62,700,000 | $ 61,500,000 |  |  |
Apio Cooling, LP [Member] | Apio [Member] |  |  |  |  |  |
Investment Ownership Percentage |  | 60.00% |  |  |  |
Apio Cooling, LP [Member] |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 60.00% |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  | $ 1,600,000 | $ 1,700,000 |  |  |
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 |  | 20.00% | 21.00% |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Wal-mart [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 12.00% | 11.00% |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | International Customers [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 31.00% | 30.00% |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | HA Based Biomaterials [Member] | Ophthalmic [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 55.00% |  |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | HA Based Biomaterials [Member] | Orthopedic [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 20.00% |  |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | HA Based Biomaterials [Member] | Other/Non-HA [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 25.00% |  |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] |  |  |  |  |  |
Number of Major Customers |  | 5 | 5 |  |  |
Concentration Risk, Percentage |  | 45.00% | 46.00% |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Costco [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 13.00% | 15.00% |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Wal-mart [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 15.00% | 13.00% |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |
Number of Major Customers |  | 2 | 2 |  |  |
HA Based Biomaterials [Member] |  |  |  |  |  |
Number of Product Segments |  | 3 |  |  |  |
Goodwill |  |  | $ 13,900,000 | 13,900,000 | $ 13,900,000 |
Biomaterials [Member] |  |  |  |  |  |
Goodwill |  | $ 13,900,000 |  |  |  |
Packaged Fresh Vegetables [Member] |  |  |  |  |  |
Goodwill |  | $ 35,700,000 |  |  |  |
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 |  |  |  |
Minimum [Member] | Customer Relationships [Member] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 12 years |  |  |  |
Maximum [Member] | Customer Relationships [Member] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 13 years |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  |  |  |
GreenLine Trademark [Member] |  |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 34,000,000 | $ 34,000,000 |  |  |  |
Indefinite-Lived Trademarks | $ 2,000,000 |  |  |  |  |
Outstanding Options and RSUs [Member] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  | 1,600,000 |  |  |  |
Goodwill, Impairment Loss |  | $ 0 | 0 | 0 |  |
Number of Proprietary Platforms |  | 2 |  |  |  |
Advertising Expense |  | $ 2,100,000 | 1,300,000 | 447,000 |  |
Capitalized Computer Software, Additions |  | 174,000 | 509,000 | 913,000 |  |
Goodwill |  | 49,620,000 | 49,620,000 |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | 34,000,000 |  |  |  |
Indefinite-Lived Trademarks |  | 14,428,000 | 48,428,000 |  |  |
Deferred Revenue |  | 832,000 | 843,000 |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  | 1,622,000 | 1,677,000 |  |  |
Deferred Tax Assets, Valuation Allowance |  | $ 1,240,000 | $ 1,234,000 |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  | 371,115 | 333,993 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares |  |  | $ 14.02 | $ 14.15 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  | $ 2.85 | $ 3.42 | $ 4.41 |  |

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