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Note 7 - Diluted Net Income Per Share (Tables) | 9 Months Ended
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Feb. 23, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended February 23, 2014 |  |  | Three Months Ended February 24, 2013 |  |  | Nine Months Ended February 23, 2014 |  |  | Nine Months Ended February 24, 2013 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income and comprehensive income applicable to common stockholders |  | $ | 6,400 |  |  | $ | 4,789 |  |  | $ | 14,603 |  |  | $ | 18,068 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for basic net income per share |  |  | 26,697 |  |  |  | 25,839 |  |  |  | 26,574 |  |  |  | 25,752 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock units |  |  | 427 |  |  |  | 828 |  |  |  | 519 |  |  |  | 740 |
Weighted average shares for diluted net income per share |  |  | 27,124 |  |  |  | 26,667 |  |  |  | 27,093 |  |  |  | 26,492 |
Diluted net income per share |  | $ | 0.24 |  |  | $ | 0.18 |  |  | $ | 0.54 |  |  | $ | 0.68 |

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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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