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Note 10 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Balance     $ 2,282,273  
Additions     93,775  
Liabilities settled     (311,235)  
Accretion expense $ 32,179 $ 36,462 96,717 $ 105,964
Balance $ 2,161,530   $ 2,161,530