Annual report pursuant to section 13 and 15(d)

DERIVATIVE INSTRUMENTS (Details)

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DERIVATIVE INSTRUMENTS (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
DERIVATIVE INSTRUMENTS [Abstract]      
Feedstock and natural gas usage to operating expenses (in hundredths) 81.30% 82.90% 80.80%
Derivatives, Fair Value [Line Items]      
Unrealized gain (loss) $ (246,000) [1] $ 215,000 [2] $ 177,000 [2]
Net cumulative loss 168,000 [1] (12,000) [2] 105,000 [2]
Unrealized loss on interest rate swap included in other comprehensive loss, tax (73,000) 6,000 (54,000)
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 5,750,000    
Derivative, variable interest rate (in hundredths) 5.83%    
Cumulative loss (892,000) (1,134,000) (1,116,000)
Deferred tax benefit 312,000 386,000 379,000
Net cumulative loss (580,000) (748,000) (737,000)
Interest expense reclassified from other comprehensive loss 359,000 414,000 468,000
Fair value of derivative liability 893,000 1,134,000  
Unrealized loss on interest rate swap included in other comprehensive loss 168,490    
Unrealized loss on interest rate swap included in other comprehensive loss, tax 73,279    
Cash flow hedge gain (loss) to be reclassified within twelve months 301,000    
Not Designated as Hedging Instrument [Member] | Commodity Financial Instruments [Member]
      
Derivatives, Fair Value [Line Items]      
Realized gain (loss) (1,386,000) 188,000 28,000
Unrealized gain (loss) (393,000) 215,000 177,000
Net gain (loss) (1,779,000) 403,000 205,000
Fair value of derivative asset $ 0 $ 393,000  
[1] Restated - see Note 3
[2] Restated - see Note 2