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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2017 | Oct. 31, 2016
Net sales | $ 23,960 | $ 23,243 | $ 70,831 | $ 65,881
Cost of goods sold | 14,907 | 14,724 | 44,530 | 41,999
Gross profit | 9,053 | 8,519 | 26,301 | 23,882
Operating expenses | 6,388 | 6,271 | 18,981 | 18,886
Operating profit | 2,665 | 2,248 | 7,320 | 4,996
Other income (loss), net | 7 | (2) | 13 | 20
Interest expense | (35) | (150) | (147) | (522)
Income before taxes | 2,637 | 2,096 | 7,186 | 4,494
Income tax expense | 831 | 583 | 1,828 | 1,548
Net income | $ 1,806 | $ 1,513 | $ 5,358 | $ 2,946
Net income per common share: |  |  |  |
Basic | $ 0.23 | $ 0.21 | $ 0.72 | $ 0.41
Diluted | $ 0.23 | $ 0.21 | $ 0.71 | $ 0.40
Weighted average common shares outstanding: |  |  |  |
Basic | 7,894,582 | 7,258,697 | 7,477,202 | 7,255,966
Diluted | 7,922,397 | 7,332,997 | 7,530,637 | 7,321,587

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