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Note 10 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Balance, December 31, 2022     $ 3,569,580  
Additions     8,904  
Liabilities settled     0  
Accretion expense $ 53,855 $ 51,680 161,501 $ 152,536
Balance, September 30, 2023 $ 3,739,985   $ 3,739,985