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Debt (Details)
3 Months Ended
Jun. 27, 2019
USD ($)
Oct. 30, 2018
USD ($)
covenant
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Apr. 01, 2019
USD ($)
Apr. 01, 2010
Contract
Debt Instrument [Line Items]              
Repayments of long-term debt     $ 0 $ 31,000      
Interest rate swap              
Debt Instrument [Line Items]              
Number of Interest rate swap agreements | Contract             2
2018 Term Notes              
Debt Instrument [Line Items]              
Repayments of long-term debt $ 21,375,000            
Term note | Senior Credit Facility | Term note              
Debt Instrument [Line Items]              
Consolidated fixed charge coverage ratio   1.25          
Term note | Senior Credit Facility | Revolving Credit Facility              
Debt Instrument [Line Items]              
Line of credit facility, current borrowing capacity 20,000,000 $ 20,000,000     $ 15,000,000    
Line of credit facility, amount outstanding   0          
Remaining balance available for borrowing   20,000          
Term note | Senior Credit Facility | 2018 Term Notes              
Debt Instrument [Line Items]              
Line of credit facility, current borrowing capacity   $ 42,500,000          
Repayments of Term Loan $ 13,000,000            
Term note | Senior Credit Facility | Term Loan              
Debt Instrument [Line Items]              
Term of debt instrument   3 years          
Line of credit facility, current borrowing capacity   $ 22,500,000          
Mortgages | Mortgage Loan On Headquarters Facility              
Debt Instrument [Line Items]              
Balloon payment           $ 2,551,000  
Debt Covenant Period, One | Term note | Senior Credit Facility | Term note              
Debt Instrument [Line Items]              
Number of financial covenants | covenant   2          
Debt Covenant Period, Two | Term note | Senior Credit Facility | Term note              
Debt Instrument [Line Items]              
Consolidated leverage ratio   2.50          
Debt Covenant Period, Three | Term note | Senior Credit Facility | Term note              
Debt Instrument [Line Items]              
Consolidated leverage ratio   2.00          
Debt Instrument, Redemption, Period One | Mortgages | Mortgage Loan On Headquarters Facility              
Debt Instrument [Line Items]              
Interest rate             5.91%
Debt Instrument, Redemption, Period Two | Mortgages | Mortgage Loan On Headquarters Facility              
Debt Instrument [Line Items]              
Interest rate             6.07%