Note 7 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value (USD $) In Thousands, unless otherwise specified	Mar. 29, 2014	Dec. 28, 2013
Note 7 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]
Available-for-sale securities	$ 13,686	$ 12,286
Total	13,686	12,286
Fair Value, Inputs, Level 1 [Member]
Note 7 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]
Available-for-sale securities	13,686	12,286
Total	$ 13,686	$ 12,286