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Note 10 - Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Balance, December 31, 2017
  $
-
 
Additions
   
179,917
 
Accretion expense
   
5,995
 
Liabilities settled
   
(11,243
)
         
Balance, June 30, 2018
  $
174,669