Annual report pursuant to Section 13 and 15(d)

Long-term Debt - Narrative (Details)

v3.20.4
Long-term Debt - Narrative (Details)
 3 Months Ended 12 Months Ended
Jan. 15, 2021
USD ($)
Jan. 01, 2019
USD ($)
Dec. 20, 2018
USD ($)
installment
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 29, 2018
USD ($)
Line of Credit Facility [Line Items]                
Long-term debt outstanding           $ 61,370,000 $ 75,554,000  
Extraordinary expenses       $ 636,000        
Palmerof Texas Tanks Inc                
Line of Credit Facility [Line Items]                
Asset impairments           $ 6,000,000.0    
Losses from suspended operations       $ 740,000 $ 1,560,000      
Revolving Line of Credit                
Line of Credit Facility [Line Items]                
Minimum fixed charge coverage ratio           1.25    
Line of credit, average outstanding amount           $ 60,300,000 $ 69,100,000  
Line of credit, weighted average interest rate           3.50% 5.52%  
Interest payments           $ 2,000,000.0 $ 3,500,000  
Covenants, minimum tangible net worth           $ 60,000,000.0    
Minimum fixed charge coverage ratio actual           1.43    
Covenants, minimum tangible net worth actual           $ 67,100,000    
The Facility | Line of Credit | Revolving Line of Credit | Subsequent Event                
Line of Credit Facility [Line Items]                
Debt term 4 years              
Line of credit, maximum borrowing capacity $ 150,000,000.0              
Initial borrowing capacity 110,000,000.0              
Minimum amount of availability required to be had under facility $ 11,000,000.0              
Minimum fixed charge coverage ratio 1.0              
The Facility | Line of Credit | LIBOR | Revolving Line of Credit | Subsequent Event                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 1.50%              
ABL Line Of Credit, Due December 20, 2021 | Revolving Line of Credit                
Line of Credit Facility [Line Items]                
Line of credit, maximum borrowing capacity     $ 100,000,000     60,000,000.0   $ 80,000,000
Principal amount of debt           $ 100,000,000    
Stated interest rate           1.81% 3.50%  
Unused capacity fee on line of credit           0.15%    
Line of credit, amount borrowed           $ 49,000,000.0    
Line of credit, remaining availability           11,000,000.0    
ABL Line Of Credit, Due December 20, 2021 | Revolving Line of Credit | LIBOR                
Line of Credit Facility [Line Items]                
Basis spread on variable rate     1.65%          
ABL Line Of Credit, Due December 20, 2021 | Line of Credit | Revolving Line of Credit                
Line of Credit Facility [Line Items]                
Line of credit, maximum borrowing capacity     $ 100,000,000.0          
Term Loan                
Line of Credit Facility [Line Items]                
Debt term   5 years 5 years          
Principal amount of debt   $ 20,000,000 $ 20,000,000          
Repayments of debt, number of consecutive installments | installment     60          
Term Loan | LIBOR                
Line of Credit Facility [Line Items]                
Basis spread on variable rate     1.90%          
Term Loan | Secured Debt                
Line of Credit Facility [Line Items]                
Debt term     5 years          
Principal amount of debt     $ 20,000,000     $ 20,000,000    
Stated interest rate           2.06% 3.69%  
Long-term debt outstanding           $ 12,300,000 $ 16,300,000  
Term Loan | Secured Debt | LIBOR | Subsequent Event                
Line of Credit Facility [Line Items]                
Basis spread on variable rate 1.65%