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Asset Retirement Obligation (Tables)
12 Months Ended
Dec. 31, 2012
Asset Retirement Obligation [Abstract]  
Changes in Asset Retirement Obligations [Table Text Block]
The following shows the changes in asset retirement obligations:

 

Asset retirement obligations, January 1, 2011   $ 883,066  
Liabilities incurred during the period     297,800  
Liabilities settled during the period     (359,513 )
Accretion     87,437  
Asset retirement obligations, December 31, 2011     908,790  
Liabilities incurred during the period     347,018  
Liabilities settled during the year     (1,427 )
Accretion     81,770  
Asset retirement obligations, December 31, 2012   $ 1,336,151