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Note 7 - Income Taxes (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2016 | May 29, 2016 | May 31, 2015 | May 25, 2014 | May 26, 2013
GreenLine Trademark [Member] |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 34,000,000 | $ 34,000,000 |  |  |
Domestic Tax Authority [Member] | California [Member] |  |  |  |  |
Operating Loss Carryforwards |  | $ 413,000 |  |  |
Domestic Tax Authority [Member] | Earliest Tax Year [Member] |  |  |  |  |
Open Tax Year |  | 1997 |  |  |
Domestic Tax Authority [Member] |  |  |  |  |
Operating Loss Carryforwards |  | $ 7,300,000 |  |  |
State and Local Jurisdiction [Member] | Indiana [Member] |  |  |  |  |
Operating Loss Carryforwards |  | 6,500,000 |  |  |
State and Local Jurisdiction [Member] | Other States, Tax Board [Member] |  |  |  |  |
Operating Loss Carryforwards |  | 13,000,000 |  |  |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |  |  |  |
Deferred Tax Asset, Operating Loss, Recorded to Additional Paid in Capital |  | 413,000 |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Research |  | 1,300,000 |  |  |
Deferred Tax Asset, Research and Development Credit, Recorded to Additional Paid in Capital |  | $ 1,100,000 |  |  |
State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |  |  |  |
Open Tax Year |  | 1998 |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 35.00% | 35.00% | 35.00% |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | $ 34,000,000 |  |  |
Effective Income Tax Rate Reconciliation, Percent |  | 39.00% | 36.00% |  |
Decrease in Net Income Before Taxes |  |  | 28.00% |  |
Deferred Tax Assets, Valuation Allowance |  | $ 1,240,000 | $ 1,234,000 |  |
Unrecognized Tax Benefits |  | 842,000 | 987,000 | $ 1,035,000 | $ 998,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | 715,000 | $ 800,000 |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible |  | $ 300,000 |  |  |

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