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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2017 | Jul. 31, 2016
Net sales | $ 23,909 | $ 22,269 | $ 46,870 | $ 42,638
Cost of goods sold | 15,219 | 13,679 | 29,623 | 27,272
Gross profit | 8,690 | 8,590 | 17,247 | 15,366
Operating expenses | 6,508 | 5,959 | 12,593 | 12,566
Operating profit | 2,182 | 2,631 | 4,654 | 2,800
Other income (loss), net | 4 | (35) | 6 | (27)
Interest expense | (36) | (175) | (112) | (373)
Income before taxes | 2,150 | 2,421 | 4,548 | 2,400
Income tax expense | 308 | 990 | 996 | 966
Net income | $ 1,842 | $ 1,431 | $ 3,552 | $ 1,434
Net income per common share: |  |  |  |
Basic | $ 0.25 | $ 0.2 | $ 0.49 | $ 0.2
Diluted | $ 0.25 | $ 0.2 | $ 0.49 | $ 0.2
Weighted average common shares outstanding: |  |  |  |
Basic | 7,266,291 | 7,254,999 | 7,265,053 | 7,254,585
Diluted | 7,280,050 | 7,311,166 | 7,316,876 | 7,315,867

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