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Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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May 28, 2017
Notes Tables |
Comprehensive Income (Loss) [Table Text Block] |
|  | Unrealized Gains on Cash Flow Hedge |
Balance as of May 29, 2016 |  | $ | — |
Other comprehensive income before reclassifications, net of tax effect |  |  | 432 |
Amounts reclassified from OCI |  |  | — |
Other comprehensive income, net |  |  | 432 |
Balance as of May 28, 2017 |  | $ | 432 |
Allowance for Credit Losses on Financing Receivables [Table Text Block] |
|  | Balance at beginning of period |  |  | Adjustments charged to revenue and expenses |  |  | Write offs, net of recoveries |  |  | Balance at end of period |
Year Ended May 31, 2015 |  | $ | 516 |  |  | $ | — |  |  | $ | (134 | ) |  | $ | 382 |
Year E nded May 29, 2016 |  | $ | 382 |  |  | $ | 63 |  |  | $ | (110 | ) |  | $ | 335 |
Year E nded May 28, 2017 |  | $ | 335 |  |  | $ | 519 |  |  | $ | (453 | ) |  | $ | 401 |
Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block] |
|  | Year E nded |
|  | May 28, 2017 |  |  | May 29, 2016 |  |  | May 31, 2015 |
Recorded upon shipment |  | $ | 456,512 |  |  | $ | 458,985 |  |  | $ | 465,848 |
Recorded upon acceptance in foreign port |  |  | 62,481 |  |  |  | 64,181 |  |  |  | 67,714 |
Revenue from multiple element arrangements |  |  | 8,431 |  |  |  | 13,400 |  |  |  | 4,253 |
Revenue from license fees, R&D contracts and royalties /profit sharing |  |  | 4,833 |  |  |  | 4,533 |  |  |  | 1,806 |
Total |  | $ | 532,257 |  |  | $ | 541,099 |  |  | $ | 539,257 |
Schedule of Inventory, Current [Table Text Block] |
|  | Year Ended |
|  | May 28 , 2017 |  |  | May 29, 2016 |
Finished goods |  | $ | 11,685 |  |  | $ | 12,165 |
Raw materials |  |  | 10,158 |  |  |  | 9,855 |
Work in progress |  |  | 3,447 |  |  |  | 3,515 |
Total inventories |  | $ | 25,290 |  |  | $ | 25,535 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year E nded |
|  | May 28, 2017 |  |  | May 29, 2016 |  |  | May 31, 2015 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) applicable to Common Stockholders |  | $ | 10,590 |  |  | $ | (11,641 | ) |  | $ | 13,544 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for basic net income (loss) per share |  |  | 27,276 |  |  |  | 27,044 |  |  |  | 26,884 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock units |  |  | 376 |  |  |  | — |  |  |  | 452 |
Weighted average shares for diluted net income (loss) per share |  |  | 27,652 |  |  |  | 27,044 |  |  |  | 27,336 |
Diluted net income (loss) per share |  | $ | 0.38 |  |  | $ | (0.43 | ) |  | $ | 0.50 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year E nded |
|  | May 28, 2017 |  |  | May 29, 2016 |  |  | May 31, 2015 |
Options |  | $ | 1,230 |  |  | $ | 1,352 |  |  | $ | 561 |
RSUs |  |  | 2,734 |  |  |  | 2,113 |  |  |  | 1,016 |
Total stock-based compensation |  | $ | 3,964 |  |  | $ | 3,465 |  |  | $ | 1,577 |
|  | Year E nded |
|  | May 28, 2017 |  |  | May 29, 2016 |  |  | May 31, 2015 |
Cost of sales |  | $ | 485 |  |  | $ | 405 |  |  | $ | 142 |
Research and development |  |  | 83 |  |  |  | 90 |  |  |  | 16 |
Selling, general and administrative |  |  | 3,396 |  |  |  | 2,970 |  |  |  | 1,419 |
Total stock-based compensation |  | $ | 3,964 |  |  | $ | 3,465 |  |  | $ | 1,577 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year E nded |
|  | May 28, 2017 |  |  | May 29, 2016 |  |  | May 31, 2015 |
Expected life (in years) |  |  | 3.50 |  |  |  | 3.38 |  |  |  | 3.25 |
Risk-free interest rate |  |  | 1.08 | % |  |  | 1.09 | % |  |  | 1.00 | %
Volatility |  |  | 26 | % |  |  | 31 | % |  |  | 32 | %
Dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Schedule of Effect of Significant Unobservable Inputs for Investment [Table Text Block] |
|  | At May 28, 2017 |  |  | At May 29, 2016 |
Revenue growth rates |  |  | 4 | % |  |  | 4 | %
Expense growth rates |  |  | 4 | % |  |  | 4 | %
Income tax rates |  |  | 15 | % |  |  | 15 | %
Discount rates |  |  | 12 | % |  |  | 12.5 | %
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] |
|  | Impact on value of investment in Windset as of May 28, 2017 |
10% increase in revenue growth rates |  | $ | 6,900 |
10% increase in expense growth rates |  | $ | (1,900 | )
10% increase in income tax rates |  | $ | (600 | )
10% increase in discount rates |  | $ | (4,500 | )
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  | Fair Value at May 28, 2017 |  |  | Fair Value at May 29, 2016 |
Assets: |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Interest rate swap (1) |  | $ | — |  |  | $ | 688 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Investment in non-public company |  |  | — |  |  |  | — |  |  |  | 63,600 |  |  |  | — |  |  |  | — |  |  |  | 62,700 |
Total |  | $ | — |  |  | $ | 688 |  |  | $ | 63,600 |  |  | $ | — |  |  | $ | — |  |  | $ | 62,700 |

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