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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