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, 2013		Oct. 31, 2012		Jul. 31, 2012		Apr. 30, 2012		Jan. 31, 2012		Oct. 31, 2011		Jul. 31, 2011		Apr. 30, 2011		Jan. 31, 2013		Jan. 31, 2012		Jan. 31, 2011
Accounting Policies [Abstract]
Net loss	$ (8,958)		$ 2,908		$ 7,053		$ (4,833)		$ (7,836)		$ (3,299)		$ 2,732		$ (5,400)		$ (3,830)		$ (13,803)		$ (17,594)
Weighted-average shares — basic																	14,387,000		14,235,000		14,130,000
Common equivalent shares from common stock options and warrants																	0		0		0
Weighted-average shares — diluted																	14,387,000	[1]	14,235,000	[1]	14,130,000	[1]
Basic	$ (0.62)	[2]	$ 0.20	[2]	$ 0.49	[2]	$ (0.34)	[2]	$ (0.55)	[2]	$ (0.23)	[2]	$ 0.19	[2]	$ (0.38)	[2]	$ (0.27)	[2]	$ (0.97)	[2]	$ (1.25)	[2]
Diluted	$ (0.62)	[2]	$ 0.20	[2]	$ 0.49	[2]	$ (0.34)	[2]	$ (0.55)	[2]	$ (0.23)	[2]	$ 0.19	[2]	$ (0.38)	[2]	$ (0.27)	[2]	$ (0.97)	[2]	$ (1.25)	[2]
Anti-dilutive common stock equivalents																	119,000		56,000		59,000

[1] For the years ended January 31, 2013, 2012 and 2011, approximately 119,000 , 56,000 and 59,000, respectively, 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.