Condensed Consolidated Statements of Income Unaudited - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Income Statement [Abstract]
Net sales	$ 61,072	$ 53,042	$ 84,120	$ 76,425
Costs of goods sold	37,076	32,346	51,930	47,699
Gross profit	23,996	20,696	32,190	28,726
Selling, general and administrative expenses	16,055	14,620	27,097	26,195
Gain on sale of property, plant & equipment	0	0	(8)	0
Restructuring expense	0	62	0	62
Operating income (loss)	7,941	6,014	5,101	2,469
Interest expense, net	453	505	750	834
Income (loss) before income taxes	7,488	5,509	4,351	1,635
Income tax expense (benefit)	38	306	77	287
Net income (loss)	$ 7,450	$ 5,203	$ 4,274	$ 1,348
Net income (loss) per common share:
Basic (usd per share)	$ 0.50	$ 0.35	$ 0.29	$ 0.09
Diluted (usd per share)	$ 0.49	$ 0.35	$ 0.28	$ 0.09
Weighted average shares outstanding:
Basic (shares)	14,887	14,725	14,856	14,687
Diluted (shares)	15,176	14,874	15,139	14,839