Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details Textual)

v2.4.0.6
Fair Value of Financial Instruments (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Fair Value of Financial Instruments (Additional 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 $ 52 $ 2
Impairment Charge on available for sale securities 61  
Phantom stock units [Member]
   
Fair Value of Financial Instruments (Textual) [Abstract]    
Phantom stock units, Vesting Period 3 years  
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  
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 $ 20 $ 142