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Note 10 - Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]

Balance, December 31, 2020

 $2,282,273 

Additions

  93,775 

Liabilities settled

  (311,235)

Accretion expense

  64,538 
     

Balance, June 30, 2021

 $2,129,351