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Additional Balance Sheet Information
9 Months Ended
Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Additional Balance Sheet Information
(3) Additional Balance Sheet Information:
Certain balance sheet amounts are comprised of the following:
 
(Thousands
 of
 dollars)
 
September 30,
2019
  
December 31,
2018
 
Accounts Receivable:
        
Joint interest billing
 $
 
6,360 
 
 
 
 $
 
 
 
 
 
 
 
 
1,976 
 
 
Trade receivables
  2,177   1,979 
Oil and gas sales
  9,148   6,112 
Tax refund receivable
  —     4,760 
Other
  285   358 
  
 
 
  
 
 
 
   17,970   15,185 
Less: Allowance for doubtful accounts
  (274)  (224
  
 
 
  
 
 
 
Total
 $17,696  $14,961 
  
 
 
  
 
 
 
Accounts Payable:
        
Trade
 $1,628  $1,174 
Royalty and other owners
  5,609   6,197 
Due to 
p
artners
  1,509   1,357 
Other
  706   825 
  
 
 
  
 
 
 
Total
 $9,452  $9,553 
  
 
 
  
 
 
 
Accrued Liabilities:
        
Compensation and related expenses
 $3,528  $2,907 
Property costs
  5,285   14,993 
Other
  249   531 
  
 
 
  
 
 
 
Total
 $9,062  $18,431