Financing Arrangements (Details) (USD $)	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Line of Credit Facility [Line Items]
Borrowing capacity under line of credit	$ 10,500,000
Maturity date of the line of credit	9/1/2012
Line of credit prime interest rate percentage	4.00%
Letters of credit issued, amount	1,342,000
Borrowing outstanding under line of credit	0	0	0
Remaining borrowing capacity under the line of credit	9,158,000
Borrowings under line of credit	0	0	0
Total rent and lease expense	759,000	546,000	328,000
Vista Research [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period	$ 0