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Summary of Business and Significant Accounting Policies (Asset Retirement Obligations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Accounting Policies [Abstract]
Asset retirement obligation beginning of period	$ 545	$ 636
Decrease in obligation	0	(100)
Accretion expense	9	9
Asset retirement obligation end of period	$ 554	$ 545

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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