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Debt - Narrative (Details)
Jun. 27, 2019
USD ($)
Oct. 30, 2018
USD ($)
covenant
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
May 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]              
Long-term debt     $ 6,927,000 $ 6,927,000      
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 $ 6,927,000    
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   $ 20,000,000 $ 15,000,000     $ 15,000,000 $ 20,000,000
Repayments of line of credit borrowings $ 13,000,000            
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