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FAIR VALUE MEASUREMENTS (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
FAIR VALUE MEASUREMENTS    
Maximum period of interest rate paid on floating-rate debt 3 months  
Transfer of assets from level 1 to level 2 $ 0  
Transfer of assets from level 2 to level 1 0  
Transfer of liabilities from level 1 to level 2 0  
Transfer of liabilities from level 2 to level 1 0  
Transfer of assets from level 3 to other levels 0  
Transfer of assets from other levels to level 3 0  
Transfer of liabilities from level 3 to other levels 0  
Transfer of liabilities from other levels to level 3 0  
Fair value measurements related to derivative instruments    
Commodity price contracts - assets 2,700,000 2,000,000
Commodity price contracts
   
Fair value measurements related to derivative instruments    
Commodity price contracts - assets 2,720,236 1,960,005
Total Carrying Value | Commodity price contracts | Recurring basis
   
Fair value measurements related to derivative instruments    
Commodity price contracts - assets 2,720,236 1,960,005
Level 2 | Commodity price contracts | Recurring basis
   
Fair value measurements related to derivative instruments    
Commodity price contracts - assets $ 2,720,236 $ 1,960,005