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, 2013
Dec. 31, 2012
Dec. 31, 2011
DERIVATIVE INSTRUMENTS [Abstract]      
Feedstock and natural gas usage to operating expenses (in hundredths) 80.60% 81.30% 82.90%
Derivatives, Fair Value [Line Items]      
Unrealized gain (loss) $ (57,000) $ (246,000) $ 215,000
Net cumulative loss 214,000 168,000 (12,000)
Unrealized loss on interest rate swap included in other comprehensive loss, tax (115,000) (73,000) 6,000
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 4,250,000    
Derivative, variable interest rate (in hundredths) 5.83%    
Cumulative loss (563,000) (892,000) (1,134,000)
Deferred tax benefit 197,000 312,000 386,000
Net cumulative loss (366,000) (580,000) (748,000)
Interest expense reclassified from other comprehensive loss 301,000 359,000 414,000
Fair value of derivative liability 563,000 893,000  
Unrealized loss on interest rate swap included in other comprehensive loss 213,809    
Unrealized loss on interest rate swap included in other comprehensive loss, tax 115,128    
Cash flow hedge gain (loss) to be reclassified within twelve months 244,000    
Not Designated as Hedging Instrument [Member] | Commodity Financial Instruments [Member]
     
Derivatives, Fair Value [Line Items]      
Realized gain (loss) 40,000 (1,386,000) 188,000
Unrealized gain (loss) (48,000) (393,000) 215,000
Net gain (loss) (8,000) (1,779,000) 403,000
Fair value of derivative liability $ 48,000 $ 0