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, 2020
Dec. 31, 2019
Dec. 31, 2018
Concentration Risk [Line Items]      
Accounts receivable $ 25,301,000 $ 26,320,000  
Undelivered feedstock 9,200,000 $ 12,400,000  
FDIC insured amount $ 250,000    
Revenue | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk 15.40% 15.00% 13.50%
Revenue | Geographic Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk 24.00% 21.90% 25.50%
Accounts Receivable      
Concentration Risk [Line Items]      
Accounts receivable $ 4,100,000 $ 4,900,000