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UNALLOCATED RESERVE AND DISTRIBUTIONS (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 31, 2023
Oct. 31, 2022
Jul. 31, 2022
Apr. 30, 2022
Jan. 31, 2022
Oct. 31, 2021
Jul. 31, 2021
Apr. 30, 2021
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2021
Unallocated Cash and Securities portion of Unallocated Reserve                      
Cash and U.S. Government securities $ 13,966,500       $ 47,727,522       $ 13,966,500 $ 47,727,522  
Distribution payable         (22,960,018)         (22,960,018)  
Unallocated cash and U.S. Government securities 13,966,500       24,767,504       13,966,500 24,767,504  
Reconciliation of Trust's Unallocated Reserve                      
Beginning Balance       $ 30,794,752         30,794,752    
Net income (loss) (3,015,037) $ (413,692) $ (4,857,371) 13,595,185 17,442,939 $ 15,992,906 $ 26,756,030 $ 8,573,870 5,309,085 68,765,745 $ 23,407,647
Distributions declared                 (24,665,620)    
Ending Balance $ 11,438,217       30,794,752       $ 11,438,217 $ 30,794,752  
Distribution declared (in dollars per share) $ 1.8800               $ 1.8800    
Distributions declared per unit (in dollars per unit)                 $ 3.63 $ 2.86 $ 1.67
Fourth quarterly distribution declared per unit (in dollars per unit)                   $ 1.75 $ 0.46
Unallocated Reserve member                      
Reconciliation of Trust's Unallocated Reserve                      
Beginning Balance       30,794,749       16,477,046 $ 30,794,749 $ 16,477,046 $ 11,831,014
Net income (loss)                 5,309,085 68,765,745 23,407,647
Distributions declared                 (24,665,620)    
Ending Balance $ 11,438,214       30,794,749       11,438,214 30,794,749 16,477,046
Trust Corpus                      
Reconciliation of Trust's Unallocated Reserve                      
Beginning Balance       $ 3       $ 3 3 3 3
Ending Balance $ 3       $ 3       $ 3 $ 3 $ 3