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Note 10 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Balance $ 2,282,273  
Additions 92,574  
Liabilities settled (311,235)  
Accretion expense 32,091 $ 34,762
Balance $ 2,095,703