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Note 1 - Organization and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Asset Retirement Obligations [Table Text Block]
   
2016
    
2015
  
                 
Beginning of period
   $
16,736,560
    $
11,108,044
 
Liabilities incurred
    
1,144
     
432
 
Liabilities settled
    
(6,609
 )    
(79,620
 )
Accretion expense
    
393,535
     
583,792
 
Revisions in estimated cash flows
    
-
     
5,123,912
 
                 
End of period
   $
17,124,630
    $
16,736,560