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Note 12 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balance $ 2,044,705 $ 1,824,419
Additions 96,864 85,294
Accretion expense 140,704 134,992
Liabilities settled 0 0
Balance $ 2,282,273 $ 2,044,705