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Note 10 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Balance     $ 1,824,419  
Additions     1,294  
Accretion expense $ 33,154 $ 2,939 65,932 $ 5,995
Liabilities settled      
Balance $ 1,891,645   $ 1,891,645