Note 3 - Fair Values of Assets and Liabilities - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Cash equivalents and short-term investments	$ 8,496	$ 8,420
Restricted cash	303	900
Total assets measured at fair value	8,799	9,320
Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	8,496	8,420
Restricted cash	303	900
Total assets measured at fair value	8,799	9,320
Money Market Funds [Member]
Cash equivalents and short-term investments	3,715	88
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	3,715	88
Corporate Bond Securities [Member]
Cash equivalents and short-term investments	3,505	7,045
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	3,505	7,045
Fixed Income Investments [Member]
Cash equivalents and short-term investments	1,276	1,287
Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents and short-term investments	$ 1,276	$ 1,287