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Debt - Narrative (Details)
9 Months Ended
Jun. 27, 2019
USD ($)
Oct. 03, 2018
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
May 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 01, 2019
USD ($)
Oct. 30, 2018
USD ($)
covenant
Apr. 30, 2010
contract
Apr. 01, 2010
Contract
Debt Instrument [Line Items]                    
Long-term debt     $ 6,927,000     $ 0        
Repayments of line of credit borrowings     0 $ 15,000,000            
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                  
PPP Loan                    
Debt Instrument [Line Items]                    
Long-term debt     6,927,000   $ 6,927,000 0        
Line of Credit | Senior Credit Facility | 2018 Term Notes                    
Debt Instrument [Line Items]                    
Credit facility term   3 years                
Maximum available for borrowing               $ 42,500,000    
Line of Credit | Senior Credit Facility | Term Loan                    
Debt Instrument [Line Items]                    
Maximum available for borrowing               22,500,000    
Line of Credit | Senior Credit Facility | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Long-term debt     $ 0              
Maximum available for borrowing           15,000,000   $ 20,000,000    
Repayments of line of credit borrowings $ 13,000,000                  
Current borrowing capacity           $ 5,000,000        
Line of Credit | Senior Credit Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Number of financial covenants | covenant               2    
Covenant compliance, maximum consolidated fixed charge coverage ratio               1.25    
Line of Credit | Senior Credit Facility | Line of Credit | Debt Covenant Period, One                    
Debt Instrument [Line Items]                    
Covenant compliance, maximum consolidated leverage ratio               2.50    
Line of Credit | Senior Credit Facility | Line of Credit | Debt Covenant Period, Two                    
Debt Instrument [Line Items]                    
Covenant compliance, maximum consolidated leverage ratio               2.00    
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%  
Mortgages | Mortgage Loan on Headquarters Facility | Period Two                    
Debt Instrument [Line Items]                    
Strike rate                 6.07%