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Note 5 - Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
 
 
Three Months Ended March 31,
 
 
 
2017
 
 
2016
 
                 
Balance at beginning of period
   $
10,128,634
    $
2,095,073
 
Additional retirement obligations incurred
    
193,216
     
-
 
Accretion expense
    
101,277
     
20,135
 
                 
Balance at end of period
   $
10,423,127
    $
2,115,208