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Note 8 - Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
  

Nine Months

Ended

September 30,

2021

 

Beginning asset retirement obligations

 $2,293 

Liabilities incurred from new wells

  877 

Liabilities assumed in acquisitions

  980 

Liabilities divested

  (6

)

Revision of estimates (a)

  (10

)

Accretion of discount

  116 

Ending asset retirement obligations

 $4,250