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Note 6 - Asset Retirement Obligation (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Asset Retirement Obligations [Table Text Block]
Balance at December 31, 2019
  $
1,821,527
 
Liabilities incurred for new wells (net of revisions)
   
4,206
 
Liabilities settled (wells sold or plugged)
   
(3,056
)
Accretion expense
   
11,412
 
Balance at March 31, 2020
  $
1,834,089