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Additional Balance Sheet Information (Tables)
 9 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Components of Balance Sheet Amounts
Certain balance sheet amounts are comprised of the following:
 
(Thousands of dollars)
  
September,
30, 2021
 
  
December 31,
2020
 
Accounts Receivable:
                  
Joint interest billing
    $ 2,589      $ 2,475  
Trade receivables
      1,866        1,073  
Oil and gas sales
      10,084        3,469  
Other
      400        802  
    
 
 
     
 
 
  
       14,939        7,819  
Less: Allowance for doubtful accounts
      (598 )       (598 ) 
    
 
 
     
 
 
  
Total
    $ 14,341      $ 7,221  
    
 
 
     
 
 
  
Accounts Payable:
                  
Trade
    $ 7,011      $ 876  
Royalty and other owners
      3,724        3,569  
Partner advances
      223        193  
Other
     
429
        579  
    
 
 
     
 
 
  
Total
    $ 11,387      $ 5,217  
    
 
 
     
 
 
  
Accrued Liabilities:
                  
Compensation and related expenses
    $ 3,259      $ 3,331  
Property costs
      2,533        2,056  
Taxes
      866        1,016  
Other
     
238
        384  
    
 
 
     
 
 
  
Total
    $ 6,896      $ 6,787