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Note 11 - Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Balance, January 1, 2018    
-
 
Additions
   
1,783,024
 
Accretion expense
   
52,639
 
Liabilities settled
   
(11,244
)
Balance, December 31, 2018
  $
1,824,419
 
Additions    
85,294
 
Accretion expense    
134,992
 
Liabilities settled    
-
 
Balance, December 31, 2019
  $
2,044,705