Note 7. Composition of Certain Financial Statement Captions (Details) - Software, Equipment and Leasehold Improvements (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Aug. 03, 2013	Feb. 02, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment balances	$ 58,267	$ 53,339
Less: Accumulated depreciation and amortization	(41,042)	(36,233)
Total software, equipment and leasehold improvements, net	17,225	17,106
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	2 years
Property, plant and equipment balances	26,955	24,216
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment balances	19,267	17,688
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	2 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	5 years
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	2 years
Property, plant and equipment balances	8,883	8,338
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment balances	$ 3,162	$ 3,097
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	6 years