Summary of Business and Significant Accounting Policies (Computation of Basic and Diluted Loss Per Share) (Details) (USD $) In Thousands, except 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
Accounting Policies [Abstract]
Net income (loss)	$ (5,131)		$ 4,632		$ 5,203		$ (3,855)		$ (6,901)		$ 3,408		$ 6,210		$ (4,447)		$ 849		$ (1,730)		$ (3,830)
Weighted-average shares — basic																	14,756,000		14,620,000		14,387,000
Dilutive effect of equity incentive plans																	231,000		0		0
Weighted-average shares — diluted																	14,987,000	[1]	14,620,000	[1]	14,387,000	[1]
Basic	$ (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]
Diluted	$ (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]
Anti-dilutive common stock equivalents																			180,000		119,000

[1] For fiscal years 2013 and 2012, approximately 180,000 and 119,000 shares of common stock equivalents, respectively, were excluded in the computation of diluted net income per share, as the effect would be anti-dilutive.

[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.