Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Details)

v3.7.0.1
DERIVATIVE INSTRUMENTS (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Derivative [Line Items]          
Feedstock and natural gas usage to operating expenses     61.20% 69.20%  
Unrealized gain (loss)     $ 55,000 $ 289,000  
Realized and unrealized gains/(losses) as a percentage of cost of sales and processing 0.00% 0.00% 0.00% 0.00%  
Unrealized loss $ 8,000 $ 1,000 $ 14,000 $ 9,000  
Realized loss $ 33,000 49,000 $ 70,000 101,000  
Maximum [Member]          
Derivative [Line Items]          
Monthly feedstock requirements hedged 40.00%   40.00%    
Interest Rate Swaps [Member]          
Derivative [Line Items]          
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 $ 2,250,000   $ 2,250,000   $ 2,750,000
Derivative, variable interest rate 5.83%   5.83%    
Fair value of interest rate swap - liability $ 122,000   $ 122,000   $ 177,000
Not Designated as Hedging Instrument [Member] | Commodity Financial Instruments [Member]          
Derivative [Line Items]          
Unrealized gain (loss) 0 0 0 180,000  
Realized gain (loss) 0 0 0 (180,000)  
Net gain $ 0 $ 0 $ 0 $ 0