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Note 9 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Note 9 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]    
Investment in Polytronics $ 12,056us-gaap_AvailableForSaleSecurities $ 12,286us-gaap_AvailableForSaleSecurities
Total 12,056us-gaap_AssetsFairValueDisclosure 12,286us-gaap_AssetsFairValueDisclosure
Fair Value, Inputs, Level 1 [Member]    
Note 9 - Fair Value of Assets and Liabilities (Details) - Assets Measured at Fair Value [Line Items]    
Investment in Polytronics 12,056us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 12,286us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Total $ 12,056us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 $ 12,286us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member