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INVESTMENTS (Details)
gal in Millions
 12 Months Ended
Jan. 31, 2020
USD ($)
gal
Jan. 31, 2019
USD ($)
Jan. 31, 2018
USD ($)
INVESTMENTS (Details) [Line Items]      
Income (Loss) from Equity Method Investments $ 1,392,000 $ 1,536,000 $ 3,232,000
Proceeds from Equity Method Investment, Distribution 1,003,000 4,010,000 6,516,000
Equity Method Investments 32,464,000 32,075,000  
Short-term Investments $ 26,073,000 $ 14,975,000  
Debt Securities, Held-to-Maturity, Weighted Average Yield, Maturity, Year One 1.80% 2.30%  
Big River [Member]      
INVESTMENTS (Details) [Line Items]      
Payments to Acquire Equity Method Investments $ 20,000,000    
Quantity of ethanol shipped (in US Gallons) | gal 424.6    
Income (Loss) from Equity Method Investments $ 1,400,000 $ 1,500,000 3,200,000
Proceeds from Equity Method Investment, Distribution 1,000,000 $ 4,000,000 $ 6,500,000
Equity Method Investments 32,500,000    
Equity Method Investment, Underlying Equity in Net Assets 27,700,000    
Other Restricted Assets 173,700,000    
Proportionate Share of Restricted Net Assets $ 17,900,000