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Note 11 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Balance, January 1, 2018 $ 1,824,419
Additions 85,294 1,783,024
Accretion expense 134,992 52,639
Liabilities settled (11,244)
Balance $ 2,044,705 $ 1,824,419