Condensed Consolidated Statements of Income Unaudited - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Income Statement [Abstract]
Net sales	$ 61,354	$ 61,072	$ 82,181	$ 84,120
Costs of goods sold	37,616	37,076	50,380	51,930
Gross profit	23,738	23,996	31,801	32,190
Selling, general and administrative expenses	16,226	16,055	27,135	27,097
Gain on sale of property, plant & equipment	0	0	(1)	(8)
Operating income	7,512	7,941	4,667	5,101
Interest expense, net	486	453	750	750
Income before income taxes	7,026	7,488	3,917	4,351
Income tax expense	140	38	170	77
Net income	$ 6,886	$ 7,450	$ 3,747	$ 4,274
Net income (loss) per common share:
Basic (usd per share)	$ 0.46	$ 0.50	$ 0.25	$ 0.29
Diluted (usd per share)	$ 0.45	$ 0.49	$ 0.25	$ 0.28
Weighted average shares outstanding:
Basic (shares)	15,036	14,887	15,004	14,856
Diluted (shares)	15,147	15,176	15,100	15,139