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Note 3 - Asset Retirement Obligations
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Asset Retirement Obligation Disclosure [Text Block]
NOTE
3—Asset
Retirement Obligations
 
The reconciliation of the beginning and ending asset retirement obligation for the
three
months ended
March 31, 2019
is as follows (in thousands):
 
   
Three Months Ended March 31, 2019
 
Beginning balance as of December 31, 2018
  $
3,791
 
Liabilities incurred    
24
 
Liabilities settled    
(1
)
Accretion expense    
72
 
Ending balance as of March 31, 2019
  $
3,886
 
Current liability   $
-
 
Long term liability   $
3,886