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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. 31, 2015
Notes Tables |
Allowance for Credit Losses on Financing Receivables [Table Text Block] |
|  | Balance at beginning of period |  |  | Additions from acquisitions and adjustments charged to revenue and expenses |  |  | Write offs, net of recoveries |  |  | Balance at end of period |
Year ended May 26, 2013 |  | $ | 512 |  |  | $ | 109 |  |  | $ | (38 | ) |  | $ | 583 |
Year ended May 25, 2014 |  | $ | 583 |  |  | $ | 143 |  |  | $ | (210 | ) |  | $ | 516 |
Year ended May 31, 2015 |  | $ | 516 |  |  | $ | — |  |  | $ | (134 | ) |  | $ | 382 |
Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block] |
|  | Year ended May 31 , 201 5 |  |  | Year ended May 25 , 201 4 |  |  | Year ended May 26 , 201 3 |
Recorded upon shipment |  | $ | 465,484 |  |  | $ | 398,938 |  |  | $ | 359,518 |
Recorded upon acceptance in foreign port |  |  | 67,714 |  |  |  | 69,710 |  |  |  | 78,442 |
Revenue from multiple element arrangements |  |  | 4,253 |  |  |  | 6,811 |  |  |  | 1,773 |
Revenue from license fees, R&D contracts and royalties/profit sharing |  |  | 1,806 |  |  |  | 1,354 |  |  |  | 1,975 |
Total |  | $ | 539,257 |  |  | $ | 476,813 |  |  | $ | 441,708 |
Schedule of Inventory, Current [Table Text Block] |
|  | May 31, 2015 |  |  | May 25, 2014 |
Finished goods |  | $ | 13,271 |  |  | $ | 11,111 |
Raw materials |  |  | 9,879 |  |  |  | 10,376 |
Work in progress |  |  | 1,877 |  |  |  | 3,248 |
Inventories, net |  | $ | 25,027 |  |  | $ | 24,735 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Fiscal Year Ended May 31, 2015 |  |  | Fiscal Year Ended May 25, 2014 |  |  | Fiscal Year Ended May 26, 2013 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income applicable to Common Stockholders |  | $ | 13,544 |  |  | $ | 19,145 |  |  | $ | 22,587 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for basic net income per share |  |  | 26,884 |  |  |  | 26,628 |  |  |  | 25,830 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock units |  |  | 452 |  |  |  | 492 |  |  |  | 796 |
Weighted average shares for diluted net income per share |  |  | 27,336 |  |  |  | 27,120 |  |  |  | 26,626 |
Diluted net income per share |  | $ | 0.50 |  |  | $ | 0.71 |  |  | $ | 0.85 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Fiscal Year Ended May 31, 2015 |  |  | Fiscal Year Ended May 25, 2014 |  |  | Fiscal Year Ended May 26, 2013 |
Options |  | $ | 561 |  |  | $ | 558 |  |  | $ | 788 |
RSUs |  |  | 1,016 |  |  |  | 798 |  |  |  | 907 |
Total stock-based compensation expense |  | $ | 1,577 |  |  | $ | 1,356 |  |  | $ | 1,695 |
|  | Fiscal Year Ended May 31, 2015 |  |  | Fiscal Year Ended May 25, 2014 |  |  | Fiscal Year Ended May 26, 2013 |
Research and development |  | $ | 38 |  |  | $ | 39 |  |  | $ | 718 |
Sales, general and administrative |  |  | 1,539 |  |  |  | 1,317 |  |  |  | 977 |
Total stock-based compensation expense |  | $ | 1,577 |  |  | $ | 1,356 |  |  | $ | 1,695 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Fiscal Year Ended May 31, 2015 |  |  | Fiscal Year Ended May 25, 2014 |  |  | Fiscal Year Ended May 26, 2013 |
Expected life (in years) |  |  | 3.25 |  |  |  | 3.50 |  |  |  | 3.76 |
Risk-free interest rate |  |  | 1.00 | % |  |  | 0.71 | % |  |  | 0.48 | %
Volatility |  |  | 0.32 |  |  |  | 0.41 |  |  |  | 0.53 |
Dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Schedule of Effect of Significant Unobservable Inputs for Investment [TableText Block] |
|  | At May 31, 2015 |  |  | At May 25, 2014 |
Annual consolidated revenue growth rates |  |  | 4 | % |  |  | 4 | %
Annual consolidated expense growth rates |  |  | 4 | % |  |  | 4 | %
Consolidated income tax rates |  |  | 15 | % |  |  | 15 | %
Consolidated discount rates |  |  | 15% to 21 | % |  |  | 16% to 22 | %
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 31, 2015 |
10% increase in revenue growth rates |  | $ | 2,300 |
10% increase in expense growth rates |  | $ | (1,200 | )
10% increase in income tax rates |  | $ | (100 | )
10% increase in discount rates |  | $ | (1,500 | )
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  | Fair Value at May 31, 2015 |  |  | Fair Value at May 25, 2014 |
Assets: |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Marketable securities |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Investment in private company |  |  | - |  |  |  | - |  |  |  | 61,500 |  |  |  | - |  |  |  | - |  |  |  | 39,600 |
Total |  | $ | - |  |  | $ | - |  |  | $ | 61,500 |  |  | $ | - |  |  | $ | - |  |  | $ | 39,600 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 44 |  |  |  | - |
Total |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 44 |  |  | $ | - |

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