v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Others (Details) - shares
3 Months Ended 6 Months Ended
Jul. 31, 2026
Jul. 31, 2025
Jul. 31, 2026
Jul. 31, 2025
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Number of units outstanding 13,120,010 13,120,010 13,120,010 13,120,010
Percentage of fee interest owned by Mesabi Land Trust in the lands subject to the Peters Lease     20.00%