CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Income Statement [Abstract]
Net sales	$ 24,009	$ 23,960	$ 73,970	$ 70,831
Cost of goods sold	15,691	14,907	46,995	44,530
Gross profit	8,318	9,053	26,975	26,301
Operating expenses	7,305	6,388	21,898	18,981
Operating profit	1,013	2,665	5,077	7,320
Other income, net	7	7	36	13
Interest expense	(25)	(35)	(93)	(147)
Income before taxes	995	2,637	5,020	7,186
Income tax expense	494	831	1,634	1,828
Net income	$ 501	$ 1,806	$ 3,386	$ 5,358
Net income per common share:
Basic	$ 0.06	$ 0.23	$ 0.42	$ 0.72
Diluted	$ 0.06	$ 0.23	$ 0.41	$ 0.71
Weighted average common shares outstanding:
Basic	8,119,488	7,894,582	8,117,307	7,477,202
Diluted	8,186,130	7,922,397	8,174,560	7,530,637