Quarterly report pursuant to sections 13 or 15(d)

DERIVATIVE INSTRUMENTS (Details)

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DERIVATIVE INSTRUMENTS (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
DERIVATIVE INSTRUMENTS [Abstract]          
Feedstock and natural gas usage to operating expenses (in hundredths)     82.90% 81.30%  
Monthly feedstock requirements hedged, Maximum 40.00%   40.00%    
Derivatives, Fair Value [Line Items]          
Unrealized gain (loss)     $ (2,206,000) $ (81,000)  
Realized and unrealized gains (losses) as a percentage of cost of sales and processing (in hundredths) 4.90% 0.10% 1.70% 0.40%  
Margin calls on outstanding financial contracts     1,500,000    
Net cumulative gain (loss) from interest rate swap 1,000 (142,000) 74,000 39,000  
Interest Rate Swap [Member]
          
Derivatives, Fair Value [Line Items]          
Fair value of interest rate swap - liability 1,021,000   1,021,000   1,134,000
Term loan in pay fixed, receive variable interest rate swap 10,000,000   10,000,000    
Term loan secured by plant, pipeline and equipment 14,000,000   14,000,000    
Notional amount 6,250,000   6,250,000    
Derivative, variable interest rate (in hundredths) 5.83%   5.83%    
Cumulative loss     (1,021,000) (1,057,000)  
Deferred tax benefit     347,000 359,000  
Net cumulative gain (loss) from interest rate swap     (674,000) (698,000)  
Interest expense reclassified from other comprehensive loss     94,000 213,000  
Cash flow hedge gain (loss) to be reclassified within twelve months     324,000    
Not Designated as Hedging Instrument [Member] | Commodity Financial Contracts [Member]
          
Derivatives, Fair Value [Line Items]          
Unrealized gain (loss) (2,815,000) (281,000) (2,283,000) (81,000)  
Realized gain 213,000 321,000 504,000 365,000  
Net gain (loss) (2,602,000) 40,000 (1,779,000) 284,000  
Fair value of financial contracts - asset (liability) $ (1,890,000)   $ (1,890,000)   $ 393,000