Quarterly report pursuant to sections 13 or 15(d)

DERIVATIVE INSTRUMENTS (Details)

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DERIVATIVE INSTRUMENTS (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
DERIVATIVE INSTRUMENTS [Abstract]      
Feedstock and natural gas usage to operating expenses (in hundredths) 80.50% 83.70%  
Monthly feedstock requirements hedged, Maximum 40.00%    
Derivatives, Fair Value [Line Items]      
Unrealized gain (loss) $ 0 [1] $ 604,000 [1]  
Fair value of financial contracts - asset (liability) 0   0
Realized and unrealized gains (losses) as a percentage of cost of sales and processing (in hundredths) 0.00% 0.10%  
Net cumulative loss 55,000 [1] 71,000 [1]  
Interest Rate Swaps [Member]
      
Derivatives, Fair Value [Line Items]      
Term loan in pay fixed, receive variable interest rate swap 10,000,000    
Term loan secured by plant, pipeline and equipment 14,000,000    
Notional amount 5,500,000    
Derivative, variable interest rate (in hundredths) 5.83%    
Cumulative loss (808,000) (1,024,000)  
Deferred tax benefit 283,000 348,000  
Net cumulative loss (525,000) (676,000)  
Interest expense reclassified from other comprehensive loss 78,000 94,000  
Fair value of interest rate swap - liability 808,000   893,000
Cash flow hedge gain (loss) to be reclassified within twelve months 287,000    
Not Designated as Hedging Instrument [Member] | Commodity Financial Instruments [Member]
      
Derivatives, Fair Value [Line Items]      
Unrealized gain (loss) 0 532,000  
Realized gain (loss) 0 291,000  
Net gain (loss) $ 0 $ 823,000  
[1] Restated - See Notes 2 and 3