CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Income Statement [Abstract]
Net sales	$ 27,464	$ 24,009	$ 79,620	$ 73,970
Cost of goods sold	18,166	15,691	52,349	46,995
Gross profit	9,298	8,318	27,271	26,975
Operating expenses	7,464	7,305	23,114	21,898
Operating profit	1,834	1,013	4,157	5,077
Other income (expense), net	(9)	7	(33)	36
Interest expense	(26)	(25)	(98)	(93)
Income before taxes	1,799	995	4,026	5,020
Income tax expense	653	494	1,950	1,634
Net income	$ 1,146	$ 501	$ 2,076	$ 3,386
Net income per common share:
Basic	$ 0.14	$ 0.06	$ 0.26	$ 0.42
Diluted	$ 0.14	$ 0.06	$ 0.26	$ 0.41
Weighted average common shares outstanding:
Basic	8,004,640	8,119,488	8,013,383	8,117,307
Diluted	8,035,929	8,186,130	8,044,159	8,174,560