Description of Business, Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) (USD $)	12 Months Ended
	Jan. 31, 2013 sqft	Jan. 31, 2012
Area of Land	53,000
Environmental liability	$ 404,000	$ 788,000
Selling, general and administrative expenses	10,152,000	7,154,000
Prepaid expenses and other current assets, net	582,000	1,802,000
Options granted, Shares	0	22,000
Costs Incurred Property Held For Sale	22,000	20,000
Research and Development Expense [Member]
Selling, general and administrative expenses	3,684,000	1,312,000
Prepaid expenses and other current assets, net	267,000	1,332,000
Recognized Costs Associated With Specific Customer Contract Requirements	1,264,000	1,407,000
Multiple Milestones [Member]
Revenue Recognition, Milestone Method, Revenue Recognized	$ 1,513,000