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Note 10 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Balance, December 31, 2022     $ 3,569,580  
Additions     0  
Liabilities settled     0  
Accretion expense $ 53,823 $ 50,924 107,646 $ 100,856
Balance, June 30, 2023 $ 3,677,226   $ 3,677,226