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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies (Details Textual) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 26, 2018 USD ($) | Feb. 25, 2018 USD ($) | Nov. 26, 2017 USD ($) | Aug. 27, 2017 USD ($) | Feb. 26, 2017 USD ($) | Nov. 27, 2016 USD ($) | Aug. 28, 2016 USD ($) | May 31, 2020 USD ($) | May 27, 2018 USD ($) $ / shares shares | May 28, 2017 USD ($) $ / shares shares | May 29, 2016 USD ($) $ / shares shares | Apr. 25, 2018 | Jul. 15, 2014
Number of Proprietary Platforms |  |  |  |  |  |  |  |  | 2 |  |  |  |
Advertising Expense |  |  |  |  |  |  |  |  | $ 1,400,000 | $ 1,900,000 | $ 2,100,000 |  |
Financing Receivable, Net, Total |  |  |  |  |  |  |  |  | 2,700,000 | 1,000,000 |  |  |
Capitalized Computer Software, Additions |  |  |  |  |  |  |  |  | 918,000 | 2,200,000 | 174,000 |  |
Goodwill, Ending Balance |  |  |  |  |  |  |  |  | 54,510,000 | 54,510,000 |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  |  |  |  |  |  | 0 | 0 | 34,000,000 |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  | 0 | 0 | $ 0 |  |
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance |  |  |  |  |  |  |  |  |  | 1,543,000 |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  |  |  |  |  |  |  |  | $ 1,337,000 | $ 1,325,000 |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  |  |  |  |  |  |  | 1,495,380 | 1,428,272 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares |  |  |  |  |  |  |  |  | $ 13.80 | $ 13.58 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  |  |  |  |  | $ 2.90 | $ 2.37 | $ 2.85 |  |
Net Cash Provided by (Used in) Operating Activities, Total |  | $ 20,300,000 | $ 6,336,000 | $ 3,450,000 | $ 26,626,000 | $ 9,712,000 | $ 9,969,000 |  | $ 19,779,000 | $ 29,738,000 | $ 20,762,000 |  |
Net Cash Provided by (Used in) Investing Activities, Total |  | (22,746,000) | (11,463,000) | (6,869,000) | (12,859,000) | (8,909,000) | (5,624,000) |  | $ (35,589,000) | (25,422,000) | (40,418,000) |  |
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Operating Activities, Total |  | 2,202,000 | 2,006,000 | 3,581,000 | 3,445,000 | 4,185,000 | 3,502,000 |  |  | 411,000 | (1,200,000) |  |
Net Cash Provided by (Used in) Investing Activities, Total |  | (2,202,000) | $ (2,006,000) | $ (3,581,000) | $ (3,445,000) | $ (4,185,000) | $ (3,502,000) |  |  | (411,000) | $ 1,200,000 |  |
Outstanding Options and RSUs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |
Apio Cooling, LP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Additional Interest in Subsidiaries | $ 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Noncontrolling Interest | $ 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
Windset [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Related Parties, Current |  |  |  |  |  |  |  |  | $ 334,000 | 388,000 |  |  |
Windset [Member] | Accounts Payable, Related Parties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Payable, Related Parties |  |  |  |  |  |  |  |  | 0 | 22,000 |  |  |
Windset [Member] | Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Related Parties |  |  |  |  |  |  |  |  | 556,000 | 514,000 | 666,000 |  |
Related Party Costs |  |  |  |  |  |  |  |  | 0 | 22,000 | 32,000 |  |
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Ending Balance |  |  |  |  |  |  |  |  | 5,200,000 | 5,200,000 | 5,200,000 |  |
Biomaterials [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Ending Balance |  |  |  |  |  |  |  |  | 13,900,000 | 13,900,000 | 13,900,000 |  |
Food Export [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Ending Balance |  |  |  |  |  |  |  |  | $ 35,400,000 | $ 35,400,000 | $ 35,400,000 |  |
O Olive & Vinegar [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Anticipated Future Earnings (Loss) After Acquisition |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  | 5 | 5 |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 49.00% | 48.00% |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | HA Based Biomaterials [Member] | Ophthalmic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 60.00% |  |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | HA Based Biomaterials [Member] | Orthopedic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | HA Based Biomaterials [Member] | Other/Non-HA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 30.00% |  |  |  |
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 |  |  |  |  |  |  |  |  | 19.00% | 20.00% |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Wal-mart [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 18.00% | 16.00% |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | International Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 20.00% | 21.00% |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Costco and Wal-mart [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  | 2 | 2 |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Costco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 13.00% | 13.00% |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Wal-mart [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 18.00% | 18.00% |  |  |
Windset [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Ownership Percentage |  |  |  |  |  |  |  |  | 26.90% |  |  |  | 26.90%
Apio Cooling, LP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 40.00% |  |  |  |  |  |  |  |  |  |  |  |
Apio Cooling, LP [Member] | Apio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  | 60.00% |

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