Annual report pursuant to section 13 and 15(d)

CONCENTRATIONS OF REVENUES AND CREDIT RISK (Details)

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CONCENTRATIONS OF REVENUES AND CREDIT RISK (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Supplier
Dec. 31, 2012
Supplier
Dec. 31, 2011
Supplier
Concentration Risk [Line Items]      
Accounts receivable $ 22,069,000 $ 15,802,000  
Accounts receivable serving as collateral for line of credit 17,700,000 11,700,000  
Number of major supplier 1 1 1
Amount owed to supplier for feedstock purchases 5,200,000 3,700,000  
Cash insured by the Federal Deposit Insurance Corporation 250,000    
Supplier Concentration Risk [Member]
     
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 99.00% 100.00% 98.00%
Sales [Member]
     
Concentration Risk [Line Items]      
Number of major customer 2 2 2
Sales [Member] | Revenue Concentration Risk [Member] | Major Customer One [Member]
     
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 16.50% 13.20% 12.90%
Sales [Member] | Revenue Concentration Risk [Member] | Major Customer Two [Member]
     
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 16.20% 12.10% 12.60%
Sales [Member] | Foreign Jurisdiction Concentration Risk [Member]
     
Concentration Risk [Line Items]      
Concentration risk, percentage (in hundredths) 26.20% 24.70% 22.20%
Accounts Receivable [Member] | Major Customer One [Member]
     
Concentration Risk [Line Items]      
Accounts receivable 1,200,000 7,700,000  
Accounts Receivable [Member] | Major Customer Two [Member]
     
Concentration Risk [Line Items]      
Accounts receivable $ 2,400,000 $ 2,100,000