Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details Textual)

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Fair Value of Financial Instruments (Details Textual) (USD $)
3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Fair Value of Financial Instruments (Textual) [Abstract]    
Securities held with stated maturities 12 months  
Securities classifies as current assets under caption marketable securities maturities 12 months  
Realized loss on available for sale securities $ 75,000 $ 52,000
Other than Temporary Impairment Losses, Investments 0  
Nonrecurring [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Fair value adjustments for assets measured at fair value 0  
Fair value adjustments for liabilities measured at fair value 0  
Phantom stock units [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Phantom stock units, Vesting Period 3 years  
Deferred director stock units and phantom stock units liability [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Recognized expense related to deferred director stock units and phantom stock units liability $ 12,000 $ 20,000