CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Income Statement [Abstract]
Net sales	$ 27,472	$ 25,616	$ 52,156	$ 49,960
Cost of goods sold	17,053	16,465	34,183	31,304
Gross profit	10,419	9,151	17,973	18,656
Operating expenses	7,781	7,505	15,650	14,593
Operating profit (loss)	2,638	1,646	2,323	4,063
Other income (expense), net	3	30	(24)	29
Interest expense	(38)	(37)	(72)	(68)
Income before taxes	2,603	1,639	2,227	4,024
Income tax expense	1,208	622	1,297	1,139
Net income	$ 1,395	$ 1,017	$ 930	$ 2,885
Net income per common share:
Basic	$ 0.17	$ 0.13	$ 0.12	$ 0.36
Diluted	$ 0.17	$ 0.12	$ 0.11	$ 0.35
Weighted average common shares outstanding:
Basic	8,012,475	8,116,199	8,013,150	8,116,199
Diluted	8,102,342	8,177,135	8,096,227	8,168,758