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Note 5 - Exploratory Well Costs (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Capitalized Exploratory Well Costs, Roll Forward [Table Text Block]
   
Successor
   
Predecessors
 
   
August 22,
through
September 30,
2020
   
January 1,
through
August 21,
2020
 
                 
Beginning capitalized exploratory well costs
   $
41,524
     $
11,427
  
Additions to exploratory well costs pending the determination of proved reserves
    
14,652
      
48,169
  
Reclassification due to determination of proved reserves
    
(33,351
 )    
(18,072
 )
Exploratory well costs charged to exploration and abandonment expense
    
-
      
-
  
Ending capitalized exploratory well costs
   $
22,825
     $
41,524