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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020
Income Statement [Abstract] |  |  |  |
Net sales | $ 33,339 | $ 34,225 | $ 108,762 | $ 113,283
Cost of products sold | 27,685 | 28,947 | 90,832 | 94,743
Gross profit | 5,654 | 5,278 | 17,930 | 18,540
Operating expenses | 6,030 | 7,350 | 18,593 | 19,875
Operating loss | (376) | (2,072) | (663) | (1,335)
Pension expense | (288) | (113) | (865) | (339)
Other income | 51 | 84 | 171 | 382
Interest expense | (105) | (150) | (310) | (452)
Loss before income taxes | (718) | (2,251) | (1,667) | (1,744)
Income tax expense (benefit) | (813) | (350) | (989) | 1,822
Net earnings (loss) | 95 | (1,901) | (678) | (3,566)
Less: Net earnings attributable to the noncontrolling interest | 14 | 17 | 19 | 59
Net earnings (loss) attributable to Kewaunee Scientific Corporation | $ 81 | $ (1,918) | $ (697) | $ (3,625)
Net earnings (loss) per share attributable to Kewaunee Scientific Corporation stockholders |  |  |  |
Basic (in dollars per share) | $ 0.03 | $ (0.70) | $ (0.25) | $ (1.32)
Diluted (in dollars per share) | $ 0.03 | $ (0.70) | $ (0.25) | $ (1.32)
Weighted average number of common shares outstanding |  |  |  |
Basic (in shares) | 2,762 | 2,750 | 2,759 | 2,750
Diluted (in shares) | 2,789 | 2,750 | 2,759 | 2,750

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