Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details Textual)

v3.5.0.2
Fair Value of Financial Instruments (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jul. 02, 2016
Jul. 02, 2016
Jun. 27, 2015
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   $ 309,000 $ 117,000
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 Share Units (PSUs) [Member]      
Fair Value of Financial Instruments (Textual) [Abstract]      
Recognized expense related to deferred director stock units and phantom stock units liability   $ 4,000 $ 17,000
Vesting period   3 years