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Note 10 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Balance     $ 3,162,725  
Additions     29,756  
Liabilities settled     0  
Accretion expense $ 50,924 $ 32,447 100,856 $ 64,538
Balance $ 3,293,337   $ 3,293,337