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Note 10 - Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Balance, December 31, 2018
  $
1,824,419
 
Additions
   
1,294
 
Accretion expense
   
65,932
 
Liabilities settled
   
-
 
         
Balance, June 30, 2019
  $
1,891,645