Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details)

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Fair Value of Financial Instruments (Details) (USD $)
Jun. 29, 2013
Dec. 29, 2012
Assets    
Assets measured at fair value, Adjusted cost $ 37,205,000  
Asset measured at, fair value 36,815,000  
Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 37,205,000 37,866,000
Assets measured at fair value, Unrealized gains 96,000 73,000
Assets measured at fair value, Unrealized losses (486,000) (239,000)
Asset measured at, fair value 36,815,000 37,700,000
Level 1 [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 2,827,000 2,538,000
Assets measured at fair value, Unrealized gains 26,000 6,000
Assets measured at fair value, Unrealized losses (166,000) (114,000)
Asset measured at, fair value 2,687,000 2,430,000
Liabilities    
Liabilities measured at fair value, Adjusted cost 59,000 293,000
Liabilities measured at fair value, Unrealized gains 0 0
Liabilities measured at fair value, Unrealized losses 0 0
Liabilities measured at fair value 59,000 293,000
Level 1 [Member] | Deferred director stock units [Member] | Recurring [Member]
    
Liabilities    
Liabilities measured at fair value, Adjusted cost   263,000
Liabilities measured at fair value, Unrealized gains   0
Liabilities measured at fair value, Unrealized losses   0
Liabilities measured at fair value   263,000
Level 1 [Member] | Phantom stock units [Member] | Recurring [Member]
    
Liabilities    
Liabilities measured at fair value, Adjusted cost 59,000 30,000
Liabilities measured at fair value, Unrealized gains 0 0
Liabilities measured at fair value, Unrealized losses 0 0
Liabilities measured at fair value 59,000 30,000
Level 1 [Member] | Equity securities [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 788,000 602,000
Assets measured at fair value, Unrealized gains 25,000 6,000
Assets measured at fair value, Unrealized losses (143,000) (86,000)
Asset measured at, fair value 670,000 522,000
Level 1 [Member] | Mutual funds [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 2,039,000 1,936,000
Assets measured at fair value, Unrealized gains 1,000 0
Assets measured at fair value, Unrealized losses (23,000) (28,000)
Asset measured at, fair value 2,017,000 1,908,000
Level 2 [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 34,378,000 35,328,000
Assets measured at fair value, Unrealized gains 70,000 67,000
Assets measured at fair value, Unrealized losses (320,000) (125,000)
Asset measured at, fair value 34,128,000 35,270,000
Level 2 [Member] | Corporate fixed income [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 18,792,000 18,270,000
Assets measured at fair value, Unrealized gains 66,000 48,000
Assets measured at fair value, Unrealized losses (272,000) (105,000)
Asset measured at, fair value 18,586,000 18,213,000
Level 2 [Member] | Government securities [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost   195,000
Assets measured at fair value, Unrealized gains   14,000
Assets measured at fair value, Unrealized losses   0
Asset measured at, fair value   209,000
Level 2 [Member] | Municipal bonds [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 4,357,000 4,525,000
Assets measured at fair value, Unrealized gains 3,000 4,000
Assets measured at fair value, Unrealized losses (16,000) (15,000)
Asset measured at, fair value 4,344,000 4,514,000
Level 2 [Member] | Certificates of deposit [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 10,111,000 10,891,000
Assets measured at fair value, Unrealized gains 1,000 1,000
Assets measured at fair value, Unrealized losses 0 0
Asset measured at, fair value 10,112,000 10,892,000
Level 2 [Member] | Asset backed securities [Member] | Recurring [Member]
    
Assets    
Assets measured at fair value, Adjusted cost 1,118,000 1,447,000
Assets measured at fair value, Unrealized gains 0 0
Assets measured at fair value, Unrealized losses (32,000) (5,000)
Asset measured at, fair value $ 1,086,000 $ 1,442,000