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SIGNIFICANT ACCOUNTING POLICIES AND DISCLOSURES (Details Narrative) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
May 28, 2016 USD ($) Number $ / shares shares | May 30, 2015 USD ($) $ / shares shares | May 31, 2014 USD ($) $ / shares shares | May 28, 2011 USD ($)
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |
Finished goods | $ 40,000 | $ 33,700 |  |
Raw material | 4,400 | 3,200 |  |
Work in progress | 1,000 | 1,900 |  |
Inventory valuation reserves | 3,400 | 3,000 |  |
Allowance for doubtful accounts | 364 | 283 |  |
Comprehensive income (loss) | (200) | 200 | $ (100) |
Investments | 9,500 | 34,700 |  |
Investments - current | 2,268 | 23,692 |  |
Other long-term investments | 7,200 | 10,900 |  |
Available-for-sale Securities, Equity Securities, Noncurrent | 600 | 600 |  |
Proceeds from the sale of securities | 300 | 200 | 200 |
Gross realized gains and losses on sales | 100 | 100 | 100 |
Net unrealized holding losses | 100 | 100 | 100 |
Depreciation | 2,000 | 1,700 | 1,000 |
Construction in progress | 2,721 | 1,218 |  |
Provision for inventory | 700 | 200 | 800 |
Other non-current liabilities | 967 | 1,221 |  |
Share-based Compensation | $ 548 | $ 726 | $ 759 |
Common stock, shares authorized | shares | 17,000,000 |  |  |
Business acquisition, transaction costs |  |  |  | $ 238,800
Number of share exercised | shares | 28,000 | 47,000 | 32,000 |
Proceeds from share exercised | $ 100 |  |  |
Intrinsic value | $ 100 | $ 200 | $ 200 |
Weighted average fair value of stock option grants (in dollars per share) | $ / shares | $ 1.21 | $ 3.71 | $ 4.53 |
Total unrecognized compensation costs | $ 1,200 |  |  |
Total grant date fair value stock options vested | $ 600 |  |  |
Minimum [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |
Period of recognization | 3 years |  |  |
Maximum [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |
Period of recognization | 4 years |  |  |
Employees' 2011 Long-Term Incentive Compensation Plan [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |
Number of shares authorized | shares | 1,500,000 |  |  |
Number of shares for future issuance | shares | 950,000 |  |  |
Exercisable term (in years) | 5 years |  |  |
Expiration term (in years) | 10 years |  |  |
Healthcare [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |
Construction in progress | $ 1,600 |  |  |
Provision for inventory | 100 |  |  |
Canvys [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |
Construction in progress | 900 |  |  |
Provision for inventory | 300 |  |  |
Electron Device Group [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |
Construction in progress | $ 200 |  |  |
Exceeds 10% Revenue [Member] | Customer Concentration Risk [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |
Number of customers | Number | 0 |  |  |
Common Class B [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |
Common stock, shares authorized | shares | 3,000,000 |  |  |

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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