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Debt Narrative (Details)
6 Months Ended
Jun. 27, 2019
USD ($)
Oct. 30, 2018
USD ($)
covenant
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Apr. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Apr. 30, 2010
contract
Apr. 01, 2010
Contract
Debt Instrument [Line Items]                  
Repayment of principal in connection with amendment   $ 17,225,000              
Long-term debt     $ 2,000,000       $ 29,365,000    
Repayments of long-term debt     2,597,000 $ 89,000          
Repayments of line of credit borrowings     13,000,000 $ 0          
Number of financial covenants | covenant   2              
Interest Rate Swap                  
Debt Instrument [Line Items]                  
Number of Interest rate swap agreements               2 2
2018 Term Notes                  
Debt Instrument [Line Items]                  
Repayments of long-term debt $ 21,375,000                
Line of Credit | Senior Credit Facility | 2018 Term Notes                  
Debt Instrument [Line Items]                  
Current borrowing capacity   $ 42,500,000              
Mandatory prepayment provision, net cash proceeds from dispositions not reinvested   100.00%              
Line of Credit | Senior Credit Facility | Line of Credit                  
Debt Instrument [Line Items]                  
Covenant compliance, maximum consolidated fixed charge coverage ratio   1.25              
Line of Credit | Senior Credit Facility | Line of Credit | Period One                  
Debt Instrument [Line Items]                  
Covenant compliance, maximum consolidated leverage ratio   3.00              
Line of Credit | Senior Credit Facility | Line of Credit | Period One | Minimum                  
Debt Instrument [Line Items]                  
Covenant compliance, maximum consolidated leverage ratio   2.75              
Line of Credit | Senior Credit Facility | Line of Credit | Period Two                  
Debt Instrument [Line Items]                  
Covenant compliance, maximum consolidated leverage ratio   2.50              
Line of Credit | Senior Credit Facility | Line of Credit | Period Two | Minimum                  
Debt Instrument [Line Items]                  
Covenant compliance, maximum consolidated leverage ratio   2.00              
Line of Credit | Senior Credit Facility | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Current borrowing capacity 20,000,000 $ 20,000,000              
Long-term line of credit   5,000,000              
Long-term debt     2,000,000            
Remaining borrowing capacity     $ 18,000,000            
Repayments of line of credit borrowings $ 13,000,000                
Line of Credit | Senior Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Current borrowing capacity   $ 22,500,000              
Security interest pledged   65.00%              
Mandatory prepayment provision, net cash proceeds from stated equity issuance   50.00%              
Mandatory prepayment provision, net cash proceeds from receipts greater than 250 thousand dollars   100.00%              
Mortgages | Mortgage Loan On Headquarters Facility                  
Debt Instrument [Line Items]                  
Periodic payment terms, balloon payment to be paid           $ 2,551,000      
Mortgages | Mortgage Loan On Headquarters Facility | Period One                  
Debt Instrument [Line Items]                  
Strike rate             5.91% 5.91%  
Mortgages | Mortgage Loan On Headquarters Facility | Period Two                  
Debt Instrument [Line Items]                  
Strike rate             6.07% 6.07%  
Forecast | Line of Credit | Senior Credit Facility | Term Loan                  
Debt Instrument [Line Items]                  
Current borrowing capacity         $ 15,000,000