Note 5 - Investments in and Notes Receivable from Privately Held Companies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended	3 Months Ended
	Aug. 02, 2014	Jan. 30, 2010 Issuer A [Member] Preferred Stock Investments [Member]	Jan. 31, 2009 Issuer A [Member] Preferred Stock Investments [Member]	Oct. 30, 2010 Issuer B [Member] Preferred Stock Investments [Member]	Feb. 01, 2014 Issuer C [Member] Preferred Stock Investments [Member]	Jan. 29, 2011 Issuer C [Member] Preferred Stock Investments [Member]	Oct. 29, 2011 Issuer D [Member]
Note 5 - Investments in and Notes Receivable from Privately Held Companies (Details) [Line Items]
Payments to Acquire Investments		$ 1.0	$ 1.0	$ 1.0		$ 1.0	$ 0.1
Other than Temporary Impairment Losses, Investments	$ 0.6				$ 0.3