Note 6 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value (USD $) In Thousands, unless otherwise specified	Mar. 28, 2015	Dec. 27, 2014
Note 6 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]
Investment in Polytronics	$ 12,862	$ 12,056
Total	12,862	12,056
Fair Value, Inputs, Level 1 [Member]
Note 6 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]
Investment in Polytronics	12,862	12,056
Total	$ 12,862	$ 12,056