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Note 12 - Quarterly Consolidated Financial Information (unaudited) - Summary of Unaudited Quarterly Results of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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May. 31, 2015 | Mar. 01, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | May. 25, 2014 | Feb. 23, 2014 | Nov. 24, 2013 | Aug. 25, 2013 | May. 26, 2013 | Feb. 24, 2013 | Nov. 25, 2012 | Aug. 26, 2012 | May. 31, 2015 | May. 25, 2014 | May. 26, 2013
Revenues | $ 134,448 | $ 138,530 | $ 132,665 | $ 133,614 | $ 120,929 | $ 126,379 | $ 120,026 | $ 109,479 | $ 107,113 | $ 117,867 | $ 114,654 | $ 102,074 | $ 539,257 | $ 476,813 | $ 441,708
Gross profit | 18,668 | 16,885 | 15,666 | 14,188 | 16,143 | 20,155 | 13,734 | 12,532 | 13,030 | 17,508 | 18,459 | 13,763 | 65,407 | 62,564 | 62,760
Net income (loss) | $ 4,196 | $ 3,772 | $ 3,223 | $ 2,353 | $ 4,542 | $ 6,400 | $ 3,451 | $ 4,752 | $ 4,519 | $ 4,789 | $ 8,913 | $ 4,366 | $ 13,544 | $ 19,145 | $ 22,587
Net income per basic share (in dollars per share) | $ 0.16 | $ 0.14 | $ 0.12 | $ 0.09 | $ 0.17 | $ 0.24 | $ 0.13 | $ 0.18 | $ 0.17 | $ 0.19 | $ 0.35 | $ 0.17 | $ 0.50 | $ 0.72 | $ 0.87
Net income per diluted share (in dollars per share) | $ 0.15 | $ 0.14 | $ 0.12 | $ 0.09 | $ 0.17 | $ 0.24 | $ 0.13 | $ 0.18 | $ 0.17 | $ 0.18 | $ 0.34 | $ 0.17 | $ 0.50 | $ 0.71 | $ 0.85

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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