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Note 10 - Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Balance, December 31, 2017
  $
-
 
Additions
   
2,096,036
 
Accretion expense
   
9,431
 
Liabilities settled
   
(11,244
)
         
Balance, September 30, 2018
  $
2,094,223