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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 26, 2013
Accounting Policies [Abstract] |
Allowance for Credit Losses on Financing Receivables [Table Text Block] |
|  | Balance at beginning of period |  |  | Additions from acquisitions and additions from charges to costs and expenses |  |  | Write offs net of recoveries |  |  | Balance at end of period |
Year ended May 29, 2011 |  | $ | 189 |  |  | $ | 209 |  |  | $ | (56 | ) |  | $ | 342 |
Year ended May 27, 2012 |  | $ | 342 |  |  | $ | 248 |  |  | $ | (78 | ) |  | $ | 512 |
Year ended May 26, 2013 |  | $ | 512 |  |  | $ | 109 |  |  | $ | (38 | ) |  | $ | 583 |
Schedule of Inventory, Current [Table Text Block] |
|  | May 26, 2013 |  |  | May 27, 2012 |
Finished goods |  | $ | 11,297 |  |  | $ | 9,406 |
Raw materials |  |  | 9,290 |  |  |  | 9,876 |
Work in progress |  |  | 3,526 |  |  |  | 2,729 |
Inventories, net |  | $ | 24,113 |  |  | $ | 22,011 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Fiscal Year Ended May 26, 2013 |  |  | Fiscal Year Ended May 27, 2012 |  |  | Fiscal Year Ended May 29, 2011 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income applicable to Common Stockholders |  | $ | 22,587 |  |  | $ | 12,696 |  |  | $ | 3,920 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for basic net income per share |  |  | 25,830 |  |  |  | 25,849 |  |  |  | 26,397 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock units |  |  | 796 |  |  |  | 277 |  |  |  | 229 |
Weighted average shares for diluted net income per share |  |  | 26,626 |  |  |  | 26,126 |  |  |  | 26,626 |
Diluted net income per share |  | $ | 0.85 |  |  | $ | 0.49 |  |  | $ | 0.15 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Fiscal Year Ended May 26, 2013 |  |  | Fiscal Year Ended May 27, 2012 |  |  | Fiscal Year Ended May 29, 2011 |
Research and development |  | $ | 718,000 |  |  | $ | 530,000 |  |  | $ | 565,000 |
Sales, general and administrative |  |  | 977,000 |  |  |  | 1,342,000 |  |  |  | 1,386,000 |
Total stock-based compensation expense |  | $ | 1,695,000 |  |  | $ | 1,872,000 |  |  | $ | 1,951,000 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Fiscal Year Ended May 26, 2013 |  |  | Fiscal Year Ended May 27, 2012 |  |  | Fiscal Year Ended May 29, 2011 |
Expected life (in years) |  |  | 3.76 |  |  |  | 3.76 |  |  |  | 3.76 |
Risk-free interest rate |  |  | 0.48% |  |  |  | 0.59% |  |  |  | 1.16% |
Volatility |  |  | 0.53 |  |  |  | 0.53 |  |  |  | 0.52 |
Dividend yield |  |  | 0% |  |  |  | 0% |  |  |  | 0% |
Schedule of Effect of Significant Unobservable Inputs for Investement [Table Text Block] |
| At May 26, 2013 | At May 27, 2012
Revenue growth rates | 3% | to | 9% | 3% | to | 24%
Expense growth rates | 3% | to | 8% | 3% | to | 18%
Income tax rates |  | 15% |  |  | 25% |
Discount rates | 18% | to | 28% | 14% | to | 21%
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 26, 2013
10% increase in revenue growth rates | $1,700
10% increase in expense growth rates | ($1,400)
10% increase in income tax rates | ($100)
10% increase in discount rates | ($900)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  | Fair Value at May 26, 2013 |  |  | Fair Value at May 27, 2012 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  | $ | 1,545 |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Investment in private company |  |  | - |  |  |  | - |  |  |  | 29,600 |  |  |  | - |  |  |  | - |  |  |  | 21,500 |
Total |  | $ | 1,545 |  |  | $ | - |  |  | $ | 29,600 |  |  | $ | - |  |  | $ | - |  |  | $ | 21,500 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 3,933 |
Interest rate swap |  |  | - |  |  |  | 163 |  |  |  | - |  |  |  | - |  |  |  | 347 |  |  |  | - |
Total |  | $ | - |  |  | $ | 163 |  |  | $ | - |  |  | $ | - |  |  | $ | 347 |  |  | $ | 3,933 |

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