Note 2 - Cash, Cash Equivalents and Marketable Securities (Details) - Amortized Cost and Estimated Fair Value of Cash Equivalents and Marketable Securities by Maturity (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Feb. 01, 2014
Note 2 - Cash, Cash Equivalents and Marketable Securities (Details) - Amortized Cost and Estimated Fair Value of Cash Equivalents and Marketable Securities by Maturity [Line Items]
Book Value	$ 18,104	$ 36,498
Fair Value	18,246	36,817
Due in 1 Year or Less [Member]
Note 2 - Cash, Cash Equivalents and Marketable Securities (Details) - Amortized Cost and Estimated Fair Value of Cash Equivalents and Marketable Securities by Maturity [Line Items]
Book Value	13,995	21,284
Fair Value	13,997	21,312
Due in Greater Than 1 Year [Member]
Note 2 - Cash, Cash Equivalents and Marketable Securities (Details) - Amortized Cost and Estimated Fair Value of Cash Equivalents and Marketable Securities by Maturity [Line Items]
Book Value	4,109	15,214
Fair Value	$ 4,249	$ 15,505