UNALLOCATED RESERVE AND DISTRIBUTIONS (Details) - USD ($)		3 Months Ended
	Apr. 15, 2022	Apr. 30, 2022	Apr. 30, 2021	Jan. 31, 2022
Unallocated Cash and Securities portion of Unallocated Reserve
Cash and U.S. Government securities		$ 37,866,017		$ 47,727,522
Distribution payable		(13,644,810)		(22,960,018)
Unallocated cash and U.S. Government securities		24,221,207		$ 24,767,504
Reconciliation of Trust's Unallocated Reserve
Beginning Balance		30,794,752	$ 16,477,049
Net income		13,595,185	8,573,870
Distributions declared		(13,644,810)	(11,676,809)
Ending Balance		30,745,127	13,374,110
Distributed cash payments		$ 22,960,018	$ 6,035,205
Distributions declared per unit (in dollars per unit)	$ 1.04	$ 1.0400	$ 0.8900
Unallocated Reserve member
Reconciliation of Trust's Unallocated Reserve
Beginning Balance		$ 30,794,749	$ 16,477,046
Net income		13,595,185	8,573,870
Distributions declared		(13,644,810)	(11,676,809)
Ending Balance		30,745,124	13,374,107
Trust Corpus
Reconciliation of Trust's Unallocated Reserve
Beginning Balance		3	3
Ending Balance		$ 3	$ 3