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Note 7 - Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
   
Year Ended December 31, 2020
   
 
 
 
   
Successor
   
Predecessors
 
   
 
August 22,
2020 through
December 31,
2020
   
January 1,
2020 through
August 21,
2020
   
Year Ended
December 31,
2019
 
Beginning asset retirement obligations
   $
2,398
     $
2,212
     $
520
  
Liabilities incurred from new wells
    
84
      
97
      
1,511
  
Liabilities settled upon plugging and abandoning wells
    
(29
 )    
-
      
(51
 )
Revision of estimates (a)
    
(211
 )    
-
      
160
  
Accretion of discount
    
51
      
89
      
72
  
Ending asset retirement obligations
   $
2,293
     $
2,398
     $
2,212