Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies. (Details)

v3.21.1
Commitments and Contingencies. (Details)
12 Months Ended
Sep. 30, 2016
USD ($)
Dec. 31, 2020
USD ($)
gal
T
Dec. 31, 2019
USD ($)
Commitments and Contingencies. (Details) [Line Items]      
Indexed price purchase contracts gallons   84,722,000  
Open fixed-price sales contracts valued   $ 16,722,000  
Property Tax Assessment [Member]      
Commitments and Contingencies. (Details) [Line Items]      
Property tax assessments $ 10,000,000    
Project Amortized Period 20 years    
Outstanding balance   9,108,000 $ 9,342,000
Additional property tax payments   $ 900,000  
Outstanding interest rate   5.60%  
Ethanol Sales Contracts [Member]      
Commitments and Contingencies. (Details) [Line Items]      
Open fixed-price sales contracts valued   $ 257,310,000  
Co-products Sales Contracts [Member]      
Commitments and Contingencies. (Details) [Line Items]      
Sales contracts (in US Tons) | T   161,000  
Ethanol Purchase Contracts [Member] | Suppliers [Member]      
Commitments and Contingencies. (Details) [Line Items]      
Indexed-price purchase contract (in US Gallons) | gal   5,814,000  
Ethanol Purchase Contracts [Member] | Fuel-grade from suppliers [Member]      
Commitments and Contingencies. (Details) [Line Items]      
Fixed-price purchase contracts value   $ 4,043,000  
Ethanol Purchase Contracts [Member] | Corn from suppliers [Member]      
Commitments and Contingencies. (Details) [Line Items]      
Fixed-price purchase contracts value   $ 22,809,000