Description of the Business and Significant Accounting Policies (Details 2) (USD $)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Changes in the allowance for doubtful accounts
Balance at beginning of period	$ 557,000	$ 400,000	$ 321,000
Add: bad debt expense	286,000	247,000	444,000
Less: write-offs, net of recoveries	(22,000)	(90,000)	(365,000)
Balance at end of period	821,000	557,000	400,000
Impairment of long-lived assets	$ 0
Cash | Credit concentration
Concentration of Risk
Number of financial institutions	1
Accounts receivable | Customer concentration
Concentration of Risk
Percentage of concentration	31.00%	17.00%
Number of customers	1	1