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NATURE OF OPERATIONS (Details)
Sep. 01, 2009
$ / shares
Dec. 31, 2019
Jan. 01, 2018
Aug. 31, 2009
$ / shares
shares
Aug. 31, 2008
$ / shares
shares
Jan. 19, 1994
Partnership
Nature of operations            
Number of other partners to ProGold joint venture | Partnership           2
Redemption price of Class A Common Voting Membership Stock (in dollars per share) | $ / shares $ 150          
Non-voting preferred stock, authorized (in shares)       10,000 10,000  
Non-voting preferred stock, authorized, par value (in dollars per share) | $ / shares       $ 1,000 $ 1,000  
Non-voting preferred stock, issued (in shares)       0 0  
Non-voting preferred stock, outstanding (in shares)       0 0  
Progold Limited Liability Company            
Nature of operations            
Ownership percentage in joint venture   49.00%        
Progold Limited Liability Company | Co Venturer            
Nature of operations            
Ownership percentage in joint venture   51.00%        
Ownership percentage available to be purchased under Option Agreement   50.00% 50.00%