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Note 10 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Balance     $ 2,282,273  
Additions     93,775  
Liabilities settled     (311,235)  
Accretion expense $ 32,447 $ 34,740 64,538 $ 69,502
Balance $ 2,129,351   $ 2,129,351