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Note 11 - Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Apr. 28, 2018 | Jan. 27, 2018 | Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Jan. 28, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Net sales | $ 244,306 | $ 227,477 | $ 244,119 | $ 259,832 | $ 212,066 | $ 194,564 | $ 203,180 | $ 217,108 | $ 975,734 | $ 826,918 | $ 704,785
Gross profit | 99,359 | 91,193 | 96,080 | 104,503 | 85,946 | 75,920 | 78,717 | 85,494 | 391,135 | 326,077 | 241,437
Net income | $ 36,442 | $ 41,080 | $ 33,980 | $ 38,272 | $ 29,161 | $ 24,285 | $ 24,604 | $ 28,995 | $ 149,774 | $ 107,045 | $ 61,198
Earnings per common share – basic (in dollars per share) | $ 0.78 | $ 0.88 | $ 0.73 | $ 0.82 | $ 0.63 | $ 0.52 | $ 0.53 | $ 0.62 | $ 3.21 | $ 2.30 | $ 1.31
Earnings per common share – diluted (in dollars per share) | 0.78 | 0.88 | 0.72 | 0.82 | 0.62 | 0.52 | 0.53 | 0.62 | 3.19 | 2.29 | 1.31
Earnings per common share – basic (in dollars per share) | 0.78 | 0.88 | 0.73 | 0.82 | 0.63 | 0.52 | 0.53 | 0.62 | 3.21 | 2.30 | 1.31
Earnings per common share – diluted (in dollars per share) | $ 0.78 | $ 0.88 | $ 0.72 | $ 0.82 | $ 0.62 | $ 0.52 | $ 0.53 | $ 0.62 | $ 3.19 | $ 2.29 | $ 1.31

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