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Note 10 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Balance     $ 2,044,705  
Additions     5,769  
Accretion expense $ 34,740 $ 33,154 69,502 $ 65,932
Liabilities settled     0  
Balance $ 2,119,976   $ 2,119,976