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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Income Statement [Abstract] |  |  |
Net sales | $ 138,558 | $ 128,626 | $ 118,828
Costs of products sold | 111,951 | 104,918 | 97,062
Gross profit | 26,607 | 23,708 | 21,766
Operating expenses | 20,065 | 18,010 | 16,540
Operating earnings | 6,542 | 5,698 | 5,226
Other income, net | 496 | 347 | 484
Interest expense | (292) | (306) | (325)
Earnings before income taxes | 6,746 | 5,739 | 5,385
Income tax expense | 2,126 | 1,862 | 1,745
Net earnings | 4,620 | 3,877 | 3,640
Less: net earnings attributable to the noncontrolling interest | 105 | 75 | 111
Net earnings attributable to Kewaunee Scientific Corporation | $ 4,515 | $ 3,802 | $ 3,529
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders |  |  |
Basic | $ 1.67 | $ 1.43 | $ 1.34
Diluted | $ 1.66 | $ 1.42 | $ 1.33
Weighted average number of common shares outstanding |  |  |
Basic | 2,705 | 2,667 | 2,626
Diluted | 2,726 | 2,687 | 2,658

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