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Note 10 - Asset Retirement Obligations (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Balance, December 31, 2019
  $
2,044,705
 
Additions
   
5,769
 
Accretion expense
   
34,762
 
Liabilities settled
   
-
 
         
Balance, March 31, 2020
  $
2,085,236