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Long-Term Debt and Capital Lease Obligations (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 29, 2017
Jun. 29, 2017
Jun. 29, 2017
Jun. 30, 2016
Dec. 29, 2016
Feb. 28, 2013
Derivative, Amount of Hedged Item             $ 25,000,000
Derivative Liability, Notional Amount   $ 25,000,000 $ 25,000,000 $ 25,000,000      
Derivative Instruments Loss Reclassified From Accumulated Income Effective Portion Net Of Tax $ 96,000            
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion $ 159,000            
Term Of Licensing Agreement     10 years        
Capital Leases, Balance Sheet, Assets by Major Class, Net   45,510,000 $ 45,510,000 45,510,000   $ 45,510,000  
Commitment Minimum Lease Payments     6,163,000        
Payments Obligation Reduced Amount     5,729,000        
Repayments of Long-term Capital Lease Obligations     516,000   $ 0    
Digital Systems [Member]              
Finite-Lived Intangible Assets, Accumulated Amortization   31,382,000 31,382,000 31,382,000   28,294,000  
Furniture and Fixtures [Member]              
Capital Leased Assets, Gross   1,712,000 1,712,000 1,712,000   159,000  
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation   132,000 132,000 132,000      
Building and Building Improvements [Member]              
Capital Leased Assets, Gross   15,799,000 15,799,000 15,799,000   $ 15,799,000  
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation   857,000 857,000 857,000      
Furniture and Fixtures AND Building and Building Improvements [Member]              
Repayments of Long-term Capital Lease Obligations   775,000 1,550,000        
Unsecured Senior Notes [Member]              
Debt Instrument, Face Amount   $ 50,000,000 $ 50,000,000 $ 50,000,000      
Debt Instrument, Interest Rate, Stated Percentage   4.32% 4.32% 4.32%      
Interest Rate Swap [Member]              
Derivative, Fixed Interest Rate             0.96%
Derivative, Variable Interest Rate   1.25% 1.25% 1.25%      
Decrease In Interest Expense     $ 40,000        
Mortgage Notes [Member]              
Debt Instrument, Basis Spread on Variable Rate     2.75%        
Debt Instrument, Face Amount   $ 15,000,000 $ 15,000,000 $ 15,000,000      
Debt Instrument, Interest Rate, Basis for Effective Rate     LIBOR plus 2.75%        
Debt Instrument, Interest Rate, Effective Percentage   3.81% 3.81% 3.81%      
Repayments of Notes Payable       $ 24,226,000