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Note 7 - Diluted Net Income Per Share (Tables) | 6 Months Ended
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Nov. 24, 2013
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended November 24, 2013 |  |  | Three Months Ended November 25, 2012 |  |  | Six Months Ended November 24, 2013 |  |  | Six Months Ended November 25, 2012 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income applicable to Common Stockholders |  | $ | 3,451 |  |  | $ | 8,913 |  |  | $ | 8,203 |  |  | $ | 13,279 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for basic net income per share |  |  | 26,571 |  |  |  | 25,747 |  |  |  | 26,512 |  |  |  | 25,709 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock units |  |  | 499 |  |  |  | 792 |  |  |  | 569 |  |  |  | 678 |
Weighted average shares for diluted net income per share |  |  | 27,070 |  |  |  | 26,539 |  |  |  | 27,081 |  |  |  | 26,387 |
Diluted net income per share |  | $ | 0.13 |  |  | $ | 0.34 |  |  | $ | 0.30 |  |  | $ | 0.50 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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