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Note 11 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Balance $ 2,282,273 $ 2,044,705
Additions 1,057,327 96,864
Accretion expense 134,360 140,704
Liabilities settled (311,235) 0
Balance $ 3,162,725 $ 2,282,273