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Note 11 - Summary of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Apr. 30, 2016 | Jan. 30, 2016 | Nov. 01, 2015 | Aug. 02, 2015 | May 02, 2015 | Jan. 31, 2015 | Nov. 01, 2014 | Aug. 02, 2014 | Apr. 30, 2016 | May 02, 2015 | May 03, 2014
Net sales | $ 179,034 | $ 161,687 | $ 178,678 | $ 185,386 | $ 164,592 | $ 143,021 | $ 163,575 | $ 174,637 | $ 704,785 | $ 645,825 | $ 641,135
Gross profit | 65,365 | 52,552 | 60,621 | 62,899 | 55,476 | 46,090 | 57,732 | 59,842 | 241,437 | 219,140 | 217,655
Net income | $ 17,537 | $ 11,236 | $ 15,312 | $ 17,113 | $ 12,182 | $ 8,808 | $ 12,958 | $ 15,363 | $ 61,198 | $ 49,311 | $ 43,635
Earnings per common share – basic (in dollars per share) | $ 0.37 | $ 0.24 | $ 0.33 | $ 0.37 | $ 0.26 | $ 0.19 | $ 0.28 | $ 0.33 | $ 1.31 | $ 1.06 | $ 0.93
Earnings per common share – diluted (in dollars per share) | $ 0.37 | $ 0.24 | $ 0.33 | $ 0.37 | $ 0.26 | $ 0.19 | $ 0.28 | $ 0.33 | $ 1.31 | $ 1.05 | $ 0.92

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: 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 4: 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=64863997&loc=d3e1252-109256 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(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: 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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