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Long-Term Debt - Term Loan Facility and Revolving Credit (Details) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2017
Jul. 31, 2019
Feb. 28, 2018
Dec. 31, 2017
Dec. 31, 2021
Dec. 31, 2020
Revolving Credit Facility            
Long-Term Debt            
Maximum borrowing capacity $ 8,000,000.0          
Borrowing capacity         $ 6,900,000 $ 8,000,000.0
Interest rate 2.25%          
Prepayment penalties until January 21, 2023 (as a percent) 3.00%          
Prepayment penalties after January 21, 2023 (as a percent) 2.00%          
Unused line fee (as a percent) 0.50%          
Weighted average interest rate         7.20% 7.20%
LIBOR | Revolving Credit Facility            
Long-Term Debt            
Basis spread on variable rate 4.95%          
Term Loan Facility            
Long-Term Debt            
Face amount of debt $ 12,000,000          
Proceeds from Issuance of Debt   $ 3,500,000 $ 3,000,000.0 $ 1,500,000    
Total amount outstanding   $ 20,000,000        
Interest rate   2.25%        
Exit fee (as a percent) 6.50%          
Weighted average interest rate         9.50% 9.50%
Percentage of casualty proceeds in excess of $250,000 to redeem loan balance 100.00%          
Percentage of cash proceeds of non-ordinary course asset sale or sale of borrowing base assets required to redeem loan balance 100.00%          
Casualty proceeds threshold amount in excess of which is used to redeem loan balance $ 250,000          
Term Loan Facility | Minimum            
Long-Term Debt            
Prepayment penalties (as a percent) 2.00%          
Term Loan Facility | Maximum            
Long-Term Debt            
Prepayment penalties (as a percent) 3.00%          
Term Loan Facility | LIBOR            
Long-Term Debt            
Variable rate divider   1.00%        
Basis spread on variable rate   7.25%