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Note 7 - Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
   
Three Months Ended March 31,
  
   
2021
   
2020
 
   
Successor
    
Predecessor
  
Beginning asset retirement obligations
   $
2,293
     $
2,212
  
Liabilities incurred from new wells
    
163
      
97
  
Revision of estimates (a)
    
(10
)
    
-
  
Accretion of discount
    
35
      
34
  
Ending asset retirement obligations
   $
2,481
     $
2,343