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Note 10 - Asset Retirement Obligations - Asset Retirement Obligations (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Balance, December 31, 2017      
Additions     2,096,036  
Accretion expense $ 3,436 9,431
Liabilities settled     (11,244)  
Balance, September 30, 2018 $ 2,094,223   $ 2,094,223