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Additional Balance Sheet Information
12 Months Ended
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Additional Balance Sheet Information
3. Additional Balance Sheet Information
Accounts receivable at December 31, 2019 and 2018 consisted of the following:
 
   
December 31,
 
(Thousands of dollars)
  
2019
   
2018
 
Joint interest billings
  $3,339   $1,976 
Trade receivables
   2,246    1,979 
Oil and gas sales
   7,284    6,112 
Tax refund receivable
   1,720    4,760 
Other
   189    358 
  
 
 
   
 
 
 
   14,778    15,185 
Less: Allowance for doubtful accounts
   (418   (224
  
 
 
   
 
 
 
Total
  $14,360   $14,961 
  
 
 
   
 
 
 
 
Accounts payable at December 31, 2019 and 2018 consisted of the following:
 
   
December 31,
 
(Thousands of dollars)
  
2019
   
2018
 
Trade
  $261   $1,174 
Royalty and other owners
   4,227    6,197 
Partner advances
   1,024    1,143 
Prepaid drilling deposits
   205    214 
Other
   917    825 
  
 
 
   
 
 
 
Total
  $    6,634   $    9,553 
  
 
 
   
 
 
 
Accrued liabilities at December 31, 2019 and 2018 consisted of the following:
 
   
December 31,
 
(Thousands
 of
  dollars)
  
2019
   
2018
 
Compensation and related expenses
  $3,620   $2,907 
Property costs
   2,829    14,993 
Other
   387    531 
  
 
 
   
 
 
 
Total
  $    6,836   $    18,431