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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 27, 2018
Notes Tables |
Comprehensive Income (Loss) [Table Text Block] |
|  | Unrealized Gains on Cash Flow Hedge |
Balance as of May 28, 2017 |  | $ | 432 |
Other comprehensive income before reclassifications, net of tax effect |  |  | 716 |
Amounts reclassified from OCI |  |  | — |
Other comprehensive income, net |  |  | 716 |
Balance as of May 27, 2018 |  | $ | 1,148 |
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 29, 2016 |  | $ | 343 |  |  | $ | 63 |  |  | $ | (110 | ) |  | $ | 296 |
Year Ended May 28, 2017 |  | $ | 296 |  |  | $ | 519 |  |  | $ | (454 | ) |  | $ | 361 |
Year Ended May 27, 2018 |  | $ | 361 |  |  | $ | 46 |  |  | $ | (105 | ) |  | $ | 302 |
Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block] |
|  | Year Ended |
|  | May 27, 2018 |  |  | May 28, 2017 |  |  | May 29, 2016 |
Recorded upon delivery |  | $ | 509,096 |  |  | $ | 456,512 |  |  | $ | 458,985 |
Revenue from multiple element arrangements |  |  | 12,531 |  |  |  | 8,431 |  |  |  | 13,400 |
Revenue from license fees, R&D contracts and royalties/profit sharing |  |  | 2,600 |  |  |  | 4,833 |  |  |  | 4,533 |
Total |  | $ | 524,227 |  |  | $ | 469,776 |  |  | $ | 476,918 |
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | May 27, 2018 |  |  | May 28, 2017 |  |  | May 29, 2016 |
Cash and cash equivalents |  | $ | 2,899 |  |  | $ | 5,998 |  |  | $ | 9,968 |
Cash, discontinued operations |  |  | (8 | ) |  |  | (589 | ) |  |  | (74 | )
Cash and cash equivalents presented on Statements of Cash Flows |  | $ | 2,891 |  |  | $ | 5,409 |  |  | $ | 9,894 |
Schedule of Inventory, Current [Table Text Block] |
|  | Year Ended |
|  | May 27, 2018 |  |  | May 28, 2017 |
Finished goods |  | $ | 12,861 |  |  | $ | 10,015 |
Raw materials |  |  | 15,286 |  |  |  | 10,158 |
Work in progress |  |  | 3,672 |  |  |  | 3,447 |
Total inventories |  | $ | 31,819 |  |  | $ | 23,620 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Year Ended |
|  | May 27, 2018 |  |  | May 28, 2017 |  |  | May 29, 2016 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) applicable to Common Stockholders |  | $ | 24,829 |  |  | $ | 10,590 |  |  | $ | (11,641 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for basic net income (loss) per share |  |  | 27,535 |  |  |  | 27,276 |  |  |  | 27,044 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock units |  |  | 380 |  |  |  | 376 |  |  |  | — |
Weighted average shares for diluted net income (loss) per share |  |  | 27,915 |  |  |  | 27,652 |  |  |  | 27,044 |
Diluted net income (loss) per share |  | $ | 0.89 |  |  | $ | 0.38 |  |  | $ | (0.43 | )
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year Ended |
|  | May 27, 2018 |  |  | May 28, 2017 |  |  | May 29, 2016 |
Options |  | $ | 1,488 |  |  | $ | 1,230 |  |  | $ | 1,352 |
RSUs |  |  | 2,915 |  |  |  | 2,734 |  |  |  | 2,113 |
Total stock-based compensation |  | $ | 4,403 |  |  | $ | 3,964 |  |  | $ | 3,465 |
|  | Year Ended |
|  | May 27, 2018 |  |  | May 28, 2017 |  |  | May 29, 2016 |
Cost of sales |  | $ | 535 |  |  | $ | 485 |  |  | $ | 405 |
Research and development |  |  | 131 |  |  |  | 83 |  |  |  | 90 |
Selling, general and administrative |  |  | 3,737 |  |  |  | 3,396 |  |  |  | 2,970 |
Total stock-based compensation |  | $ | 4,403 |  |  | $ | 3,964 |  |  | $ | 3,465 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended |
|  | May 27, 2018 |  |  | May 28, 2017 |  |  | May 29, 2016 |
Expected life (in years) |  |  | 3.50 |  |  |  | 3.50 |  |  |  | 3.38 |
Risk-free interest rate |  |  | 1.73 | % |  |  | 1.08 | % |  |  | 1.09 | %
Volatility |  |  | 27 | % |  |  | 26 | % |  |  | 31 | %
Dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Schedule of Effect of Significant Unobservable Inputs for Investment [Table Text Block] |
|  | At May 27, 2018 |  |  | At May 28, 2017 |
Revenue growth rates |  |  | 6 | % |  |  | 4 | %
Expense growth rates |  |  | 6 | % |  |  | 4 | %
Income tax rates |  |  | 15 | % |  |  | 15 | %
Discount rates |  |  | 12 | % |  |  | 12 | %
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] |
|  | Impact on value of Windset investment as of May 27, 2018 |
10% increase in revenue growth rates |  | $ | 9,700 |
10% increase in expense growth rates |  | $ | (9,100 | )
10% increase in income tax rates |  | $ | (500 | )
10% increase in discount rates |  | $ | (4,300 | )
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  | Fair Value at May 27, 2018 |  |  | Fair Value at May 28, 2017 |
Assets (liabilities): |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Interest rate swap (1) |  | $ | — |  |  | $ | 1,529 |  |  | $ | — |  |  | $ | — |  |  | $ | 688 |  |  | $ | — |
Investment in non-public company |  |  | — |  |  |  | — |  |  |  | 66,500 |  |  |  | — |  |  |  | — |  |  |  | 63,600 |
Contingent consideration liability (2) |  |  | — |  |  |  | — |  |  |  | (4,000 | ) |  |  | — |  |  |  | — |  |  |  | (5,900 | )
Total |  | $ | — |  |  | $ | 1,529 |  |  | $ | 62,500 |  |  | $ | — |  |  | $ | 688 |  |  | $ | 57,700 |

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