Valuation and Qualifying Accounts and Reserves (Details) (Allowance for Doubtful Accounts Receivable [Member], USD $)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Allowance for Doubtful Accounts Receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 671,000	$ 549,000
Accrual amount - charged to expenses	422,000	(71,000)
Recoveries (Write-offs), net	(246,000)	193,000
Balance at end of period	$ 847,000	$ 671,000