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Note 5 - Asset Retirement Obligations
 6 Months Ended
Jun. 30, 2017
Notes to Financial Statements  
Asset Retirement Obligation Disclosure [Text Block]
5.
         Asset Retirement Obligations
 
 
Changes in the carrying amount of our asset retirement obligations were as follows:
 
 
 
 
Three Months Ended June 30
 
 
Six Months Ended June 30,
 
 
 
2017
 
 
2016
 
 
2017
 
 
2016
 
                                 
Balance at beginning of period
   $
10,423,127
    $
2,115,208
    $
10,128,634
    $
2,095,073
 
Additional retirement obligations incurred
    
 285,705
      
 -
      
478,921
     
-
 
Accretion expense
    
101,276
      
20,134
     
202,553
     
40,269
 
Balance at end of period
   $
10,810,108
    $ 
2,135,342
    $
10,810,108
    $
2,135,342