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Note 10 - Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]

Balance, December 31, 2019

 $2,044,705 

Additions

  96,864 

Accretion expense

  105,964 

Liabilities settled

  - 
     

Balance, September 30, 2020

 $2,247,533