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Note 10 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Balance     $ 1,824,419  
Additions     69,294  
Accretion expense $ 33,154 $ 3,436 99,086 $ 9,431
Liabilities settled      
Balance $ 1,992,799   $ 1,992,799