Summary of Business and Significant Accounting Policies (Computation of Basic and Diluted Loss Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended																12 Months Ended
		Jan. 31, 2016		Oct. 31, 2015		Jul. 31, 2015		Apr. 30, 2015		Jan. 31, 2015		Oct. 31, 2014		Jul. 31, 2014		Apr. 30, 2014		Jan. 31, 2016		Jan. 31, 2015		Jan. 31, 2014
Accounting Policies [Abstract]
Net income (loss)		$ (5,726)		$ 6,003		$ 7,450		$ (3,178)		$ (5,131)		$ 4,632		$ 5,203		$ (3,855)		$ 4,549		$ 849		$ (1,730)
Weighted-average shares — basic																		14,914,000		14,756,000		14,620,000
Dilutive effect of equity incentive plans																		204,000		231,000		0
Weighted-average shares — diluted	[1]																	15,118,000		14,987,000		14,620,000
Basic		$ (0.38)	[2]	$ 0.40	[2]	$ 0.50	[2]	$ (0.21)	[2]	$ (0.35)	[2]	$ 0.31	[2]	$ 0.35	[2]	$ (0.26)	[2]	$ 0.31	[3]	$ 0.06	[3]	$ (0.12)	[3]
Diluted		$ (0.38)	[2]	$ 0.39	[2]	$ 0.49	[2]	$ (0.21)	[2]	$ (0.35)	[2]	$ 0.31	[2]	$ 0.35	[2]	$ (0.26)	[2]	$ 0.30	[3]	$ 0.06	[3]	$ (0.12)	[3]
Anti-dilutive common stock equivalents																						180,000

[1] For fiscal year 2014, approximately 180,000 shares of common stock equivalents 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 year 2014 was calculated based on basic shares outstanding due to the anti-dilutive effect on the inclusion of common stock equivalent shares.