CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Income Statement [Abstract]
Net sales	$ 25,616	$ 23,909	$ 49,960	$ 46,870
Cost of goods sold	16,465	15,219	31,304	29,623
Gross profit	9,151	8,690	18,656	17,247
Operating expenses	7,505	6,508	14,593	12,593
Operating profit	1,646	2,182	4,063	4,654
Other income, net	30	4	29	6
Interest expense	(37)	(36)	(68)	(112)
Income before taxes	1,639	2,150	4,024	4,548
Income tax expense	622	308	1,139	996
Net income	$ 1,017	$ 1,842	$ 2,885	$ 3,552
Net income per common share:
Basic	$ 0.13	$ 0.25	$ 0.36	$ 0.49
Diluted	$ 0.12	$ 0.25	$ 0.35	$ 0.49
Weighted average common shares outstanding:
Basic	8,116,199	7,266,291	8,116,199	7,265,053
Diluted	8,177,135	7,280,050	8,168,758	7,316,876