Note 3 - Fair Values of Assets and Liabilities - Assets and Liabilites Measured at Fair Value (Details) - USD ($) $ in Thousands	Oct. 29, 2016	Jan. 30, 2016
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	$ 3,513	$ 7,045
Corporate Bond Securities [Member]
Cash equivalents and short-term investments	3,513	7,045
Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	1,281	1,287
Fixed Income Investments [Member]
Cash equivalents and short-term investments	1,281	1,287
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	3,704	88
Money Market Funds [Member]
Cash equivalents and short-term investments	3,704	88
Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	8,498	8,420
Restricted cash	316	900
Total assets measured at fair value	8,814	9,320
Cash equivalents and short-term investments	8,498	8,420
Restricted cash	316	900
Total assets measured at fair value	$ 8,814	$ 9,320