Quarterly Results (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Jan. 31, 2015		Oct. 31, 2014		Jul. 31, 2014		Apr. 30, 2014		Jan. 31, 2014		Oct. 31, 2013		Jul. 31, 2013		Apr. 30, 2013		Jan. 31, 2015		Jan. 31, 2014		Jan. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 25,354	[1]	$ 62,273	[1]	$ 53,042	[1]	$ 23,383	[1]	$ 19,480	[1]	$ 59,055	[1]	$ 56,794	[1]	$ 19,713	[1]	$ 164,052		$ 155,042		$ 157,913
Gross profit	6,000	[1]	20,672	[1]	20,696	[1]	8,030	[1]	4,113	[1]	20,762	[1]	21,447	[1]	6,232	[1]	55,398		52,554		50,609
Net income (loss)	$ (5,131)		$ 4,632		$ 5,203		$ (3,855)		$ (6,901)		$ 3,408		$ 6,210		$ (4,447)		$ 849		$ (1,730)		$ (3,830)
Per common share
Basic (dollar per share)	$ (0.35)	[2]	$ 0.31	[2]	$ 0.35	[2]	$ (0.26)	[2]	$ (0.47)	[2]	$ 0.23	[2]	$ 0.43	[2]	$ (0.31)	[2]	$ 0.06	[3]	$ (0.12)	[3]	$ (0.27)	[3]
Assuming dilution (dollar per share)	$ (0.35)	[2]	$ 0.31	[2]	$ 0.35	[2]	$ (0.26)	[2]	$ (0.47)	[2]	$ 0.23	[2]	$ 0.42	[2]	$ (0.31)	[2]	$ 0.06	[3]	$ (0.12)	[3]	$ (0.27)	[3]

[1] The Company revised the presentation of previously reported amounts to be consistent with the presentation for the year ended January 31, 2015. The changes resulted in decreases to net sales, gross margin and selling, general, and administrative expenses for the quarters ended January 31, 2015 and 2014, respectively.

[2] Net loss per share was calculated based on basic shares outstanding due to the anti-dilutive effect on the inclusion of common stock equivalent shares.

[3] Net loss per share for fiscal years 2013 and 2012 were calculated based on basic shares outstanding due to the anti-dilutive effect on the inclusion of common stock equivalent shares.