Note 8 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Note 8 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]
Total	$ 11,136	$ 18,993
Polytronics [Member] | Fair Value, Inputs, Level 1 [Member]
Note 8 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]
Investments	11,136	10,327
Polytronics [Member]
Note 8 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]
Investments	11,136	10,327
Affiliated Entity [Member] | Fair Value, Inputs, Level 3 [Member]
Note 8 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]
Investments		8,666
Affiliated Entity [Member]
Note 8 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]
Investments		8,666
Fair Value, Inputs, Level 1 [Member]
Note 8 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]
Total	11,136	10,327
Fair Value, Inputs, Level 3 [Member]
Note 8 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]
Total		$ 8,666