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Note 10 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Balance     $ 2,044,705  
Additions     96,864  
Accretion expense $ 36,462 $ 33,154 105,964 $ 99,086
Liabilities settled     0  
Balance $ 2,247,533   $ 2,247,533