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Debt Narrative (Details)
9 Months Ended
Jun. 27, 2019
USD ($)
Oct. 30, 2018
USD ($)
covenant
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2020
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     $ 0         $ 29,365,000    
Repayments of long-term debt     2,597,000 $ 136,000            
Repayments of line of credit borrowings     $ 15,000,000 $ 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 leverage ratio     2.75              
Covenant compliance, maximum consolidated fixed charge coverage ratio   1.25                
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     $ 0              
Remaining borrowing capacity     $ 20,000,000              
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 | Line of Credit                    
Debt Instrument [Line Items]                    
Covenant compliance, maximum consolidated leverage ratio         2.00 2.50        
Forecast | Line of Credit | Senior Credit Facility | Term Loan                    
Debt Instrument [Line Items]                    
Current borrowing capacity           $ 15,000,000