Revolving Credit Facility (Details)
$ in Thousands
3 Months Ended 9 Months Ended
May 12, 2020
Mar. 20, 2020
USD ($)
Aug. 18, 2015
USD ($)
bbl / agreement
Oct. 27, 2011
USD ($)
Aug. 01, 2020
USD ($)
Oct. 31, 2020
USD ($)
Revolving Line of Credit            
Borrowings under revolving credit facility           $ 43,700
Debt repaid         $ 2,100  
Line of Credit            
Revolving Line of Credit            
Term of credit facility       5 years    
Maximum borrowing capacity     $ 50,000 $ 50,000    
Borrowings under revolving credit facility   $ 43,700        
Borrowing capacity, accordion feature     25,000      
Maximum borrowing capacity including accordion expansion     $ 75,000      
Number of covenants | bbl / agreement     1      
Unused commitment fee (as a percent)     0.25%      
Line of Credit | Minimum            
Revolving Line of Credit            
Effective interest rate (as a percent)   1.625%        
Line of Credit | Maximum            
Revolving Line of Credit            
Effective interest rate (as a percent)   3.50%        
Line of Credit | LIBOR | Minimum            
Revolving Line of Credit            
Margin added to variable rate (as a percent)     2.25%      
Line of Credit | LIBOR | Maximum            
Revolving Line of Credit            
Margin added to variable rate (as a percent)     2.50%      
Line of Credit | Federal Fund Rate | Minimum            
Revolving Line of Credit            
Margin added to variable rate (as a percent)     0.50%      
Line of Credit | LIBOR, One Month            
Revolving Line of Credit            
Increase pricing for loans (as a percent) 1.00%          
Line of Credit | LIBOR, One Month | Minimum            
Revolving Line of Credit            
Margin added to variable rate (as a percent) 1.25%          
Line of Credit | LIBOR, One Month | Maximum            
Revolving Line of Credit            
Margin added to variable rate (as a percent) 1.50%