Condensed Consolidated Statements of Income Unaudited - USD ($) shares in Thousands, $ 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	$ 76,809	$ 68,794	$ 174,180	$ 164,665
Costs of goods sold	50,379	44,327	112,933	105,088
Gross profit	26,430	24,467	61,247	59,577
Selling, general and administrative expenses	21,765	19,798	52,756	49,768
Gain on sale of property, plant & equipment	0	(15)	(1)	(16)
Operating income	4,665	4,684	8,492	9,825
Interest expense, net	630	456	1,898	1,280
Income (loss) before income taxes	4,035	4,228	6,594	8,545
Income tax (benefit) expense	1,103	1,704	1,759	3,204
Net income (loss)	$ 2,932	$ 2,524	$ 4,835	$ 5,341
Dividend declared per share: Cash (usd per share)	$ 0.015	$ 0	$ 0.045	$ 0
Net income (loss) per common share:
Basic (usd per share)	0.19	0.16	0.31	0.35
Diluted (usd per share)	$ 0.19	$ 0.16	$ 0.31	$ 0.35
Weighted average shares outstanding:
Basic (shares)	15,486	15,317	15,399	15,220
Diluted (shares)	15,582	15,483	15,491	15,324