Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Details)

v3.2.0.727
DERIVATIVE INSTRUMENTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
DERIVATIVE INSTRUMENTS [Abstract]          
Feedstock and natural gas usage to operating expenses (in hundredths)     69.20% 81.80%  
Monthly feedstock requirements hedged, Maximum (in hundredths) 40.00%   40.00%    
Derivatives, Fair Value [Line Items]          
Unrealized gain (loss)     $ 289 $ 48  
Fair value of financial contracts - liability $ 0   $ 0   $ 180
Realized and unrealized gains (losses) as a percentage of cost of sales and processing (in hundredths) 0.00% 0.00% 0.00% 0.00%  
Interest expense reclassified from other comprehensive loss $ 0 $ (63) $ 0 $ (130)  
Unrealized gain (loss) (1)   9    
Realized loss 49   101    
Interest Rate Swaps [Member]          
Derivatives, Fair Value [Line Items]          
Term loan in pay fixed, receive variable interest rate swap 10,000   10,000    
Term loan secured by plant, pipeline and equipment 14,000   14,000    
Notional amount $ 3,250   $ 3,250   3,750
Derivative, variable interest rate (in hundredths) 5.83%   5.83%    
Cumulative loss     $ 0 (466)  
Deferred tax benefit     0 163  
Net cumulative loss     0 (303)  
Fair value of interest rate swap - liability $ 269   269   $ 378
Interest Rate Swaps [Member] | Qualifying Cash Flow Hedges [Member] | Reclassification [Member]          
Derivatives, Fair Value [Line Items]          
Interest expense reclassified from other comprehensive loss     0 130  
Not Designated as Hedging Instrument [Member] | Commodity Financial Instruments [Member]          
Derivatives, Fair Value [Line Items]          
Unrealized gain (loss) 0 0 180 (48)  
Realized gain (loss) 0 0 (180) 87  
Net gain $ 0 $ 0 $ 0 $ 39