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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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May 28, 2017 | Feb. 26, 2017 | Nov. 27, 2016 | Aug. 28, 2016 | May 29, 2016 | Feb. 28, 2016 | Nov. 29, 2015 | Aug. 30, 2015 | May 31, 2015 | Mar. 01, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | May 28, 2017 | May 29, 2016 | May 31, 2015
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 2,452 | $ 3,500 | $ 1,326 | $ 3,312 | $ 4,729 | $ (21,190) | $ 1,868 | $ 2,952 | $ 4,196 | $ 3,772 | $ 3,223 | $ 2,353 | $ 10,590 | $ (11,641) | $ 13,544
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares for basic net income (loss) per share (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 27,276 | 27,044 | 26,884
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options and restricted stock units (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 376 |  | 452
Weighted average shares for diluted net income (loss) per share (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 27,652 | 27,044 | 27,336
Net income (loss) per diluted share (in dollars per share) | $ 0.09 | $ 0.13 | $ 0.05 | $ 0.12 | $ 0.17 | $ (0.78) | $ 0.07 | $ 0.11 | $ 0.15 | $ 0.14 | $ 0.12 | $ 0.09 | $ 0.38 | $ (0.43) | $ 0.50

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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