Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details)

v3.2.0.727
Fair Value of Financial Instruments (Details) - USD ($)
Jun. 27, 2015
Dec. 27, 2014
Assets    
Asset measured at, fair value $ 43,749,000  
Recurring [Member]    
Assets    
Assets measured at fair value, Adjusted cost 45,345,000 $ 44,713,000
Assets measured at fair value, Unrealized gains 49,000 73,000
Assets measured at fair value, Unrealized losses (1,645,000) (1,433,000)
Asset measured at, fair value 43,749,000 43,353,000
Level 1 [Member] | Recurring [Member]    
Assets    
Assets measured at fair value, Adjusted cost 5,079,000 5,251,000
Assets measured at fair value, Unrealized gains 37,000 67,000
Assets measured at fair value, Unrealized losses (527,000) (509,000)
Asset measured at, fair value 4,589,000 4,809,000
Liabilities    
Liabilities measured at fair value, Unrealized gains 0 0
Liabilities measured at fair value, Unrealized losses 0 0
Liabilities measured at fair value 47,000 30,000
Convertible Debt, Fair Value Disclosures 47,000 30,000
Level 1 [Member] | Phantom Share Units (PSUs) [Member] | Recurring [Member]    
Assets    
Liabilities Measured at Fair Value Adjusted Cost 47,000 30,000
Liabilities    
Liabilities measured at fair value, Unrealized gains 0 0
Liabilities measured at fair value, Unrealized losses 0 0
Liabilities measured at fair value 47,000 30,000
Level 1 [Member] | Equity securities [Member] | Recurring [Member]    
Assets    
Assets measured at fair value, Adjusted cost 1,591,000 2,145,000
Assets measured at fair value, Unrealized gains 32,000 65,000
Assets measured at fair value, Unrealized losses (212,000) (282,000)
Asset measured at, fair value 1,411,000 1,928,000
Level 1 [Member] | Mutual funds [Member] | Recurring [Member]    
Assets    
Assets measured at fair value, Adjusted cost 3,488,000 3,106,000
Assets measured at fair value, Unrealized gains 5,000 2,000
Assets measured at fair value, Unrealized losses (315,000) (227,000)
Asset measured at, fair value 3,178,000 2,881,000
Level 2 [Member] | Recurring [Member]    
Assets    
Assets measured at fair value, Adjusted cost 40,266,000 39,462,000
Assets measured at fair value, Unrealized gains 12,000 6,000
Assets measured at fair value, Unrealized losses (1,118,000) (924,000)
Asset measured at, fair value 39,160,000 38,544,000
Level 2 [Member] | Corporate fixed income [Member] | Recurring [Member]    
Assets    
Assets measured at fair value, Adjusted cost 34,272,000 33,740,000
Assets measured at fair value, Unrealized gains 12,000 6,000
Assets measured at fair value, Unrealized losses (1,013,000) (868,000)
Asset measured at, fair value 33,271,000 32,878,000
Level 2 [Member] | Municipal bonds [Member] | Recurring [Member]    
Assets    
Assets measured at fair value, Adjusted cost 3,038,000 2,441,000
Assets measured at fair value, Unrealized gains 0 0
Assets measured at fair value, Unrealized losses (76,000) (33,000)
Asset measured at, fair value 2,962,000 2,408,000
Level 2 [Member] | Certificates of deposit [Member] | Recurring [Member]    
Assets    
Assets measured at fair value, Adjusted cost 2,237,000 2,439,000
Assets measured at fair value, Unrealized gains 0 0
Assets measured at fair value, Unrealized losses 0 0
Asset measured at, fair value 2,237,000 2,439,000
Level 2 [Member] | Asset backed securities [Member] | Recurring [Member]    
Assets    
Assets measured at fair value, Adjusted cost 719,000 842,000
Assets measured at fair value, Unrealized gains 0 0
Assets measured at fair value, Unrealized losses (29,000) (23,000)
Asset measured at, fair value $ 690,000 $ 819,000