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Note 8 - Income Taxes (Details Textual) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 27, 2017 | Feb. 28, 2016 | May 28, 2017 | May 29, 2016 | May 31, 2015 | May 25, 2014
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 35.00% |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | $ 0 |  | $ 0 | $ 34,000,000 | [1] |  | [1] |
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 29.00% | 39.00% |  |  |  |
Excess Tax Deficiencies from Share-based Compensation |  |  |  | $ 192,000 |  |  |  |  |
Deferred Tax Assets, Gross |  |  |  | 9,751,000 | $ 7,696,000 |  |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations |  |  |  | 29,327,000 | 21,934,000 | [1] | 26,618,000 | [1] |
Net Cash Provided by (Used in) Financing Activities, Continuing Operations |  |  |  | (8,801,000) | 15,423,000 | [1] | 7,706,000 | [1] |
Deferred Tax Assets, Valuation Allowance |  |  |  | 1,325,000 | 1,240,000 |  |  |  |
Unrecognized Tax Benefits |  |  |  | 537,000 | 842,000 |  | 987,000 |  | $ 1,035,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  |  |  | 419,000 |  |  |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  |  |  | 215,000 |  |  |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  | 6,800,000 |  |  |  |  |
Domestic Tax Authority [Member] | Indiana [Member] |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  | 5,700,000 |  |  |  |  |
Domestic Tax Authority [Member] | Other States, Tax Board [Member] |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  | $ 3,000,000 |  |  |  |  |
State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |  |  |  |  |  |  |  |
Open Tax Year |  |  |  | 1998 |  |  |  |  |
State and Local Jurisdiction [Member] | California [Member] |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research |  |  |  | $ 1,200,000 |  |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | [2] |  |  | 423,000 |  |  |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | [2] |  |  | 200,000 |  |  |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations |  |  |  |  | 150,000 |  | 463,000 |  |
Net Cash Provided by (Used in) Financing Activities, Continuing Operations |  |  |  |  | (150,000) |  | $ (463,000) |  |
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 549,000 |  |  |  |
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member] | Changes In Forfeiture Method [Member] |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | (126,000) |  |  |  |
Accounting Standards Update 2016-09 [Member] | Additional Paid-in Capital [Member] | Changes In Forfeiture Method [Member] |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 200,000 |  |  |  |
Changes In Forfeiture Method [Member] |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Gross |  |  |  |  | $ (74,000) |  |  |  |
GreenLine Trademark [Member] |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  | $ 34,000,000 | $ 34,000,000 |  |  |  |  |
[1] | See Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies for a discussion of accounting principles adopted during the period.
[2] | See Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies for a discussion of accounting guidance adopted during the period.

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