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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue (Details)
 1 Months Ended 12 Months Ended
Oct. 29, 2021
USD ($)
Jul. 31, 2021
USD ($)
item
Jan. 31, 2023
USD ($)
contract
item
MT
shares
Jan. 31, 2022
USD ($)
shares
Jan. 31, 2021
shares
Disaggregation of Revenue [Line Items]          
Number of units outstanding | shares     13,120,010 13,120,010 13,120,010
Cash and Cash Equivalents          
Amount held by the Trust in a money market fund     $ 13,966,500 $ 47,727,522  
Investments          
Assets Held-in-trust     0 0  
Revenue from Contract with Customer [Abstract]          
Number of members on panel for arbitration | item   3      
Litigation settlement, damages $ 2,312,106 $ 2,312,106      
Litigation settlement, interest 521,581 $ 430,710      
Proceeds from Legal Settlements $ 2,833,687        
Accrued income receivable     $ 23,562 4,631,510  
Number of customer contracts | contract     1    
Contract asset       1,431,633  
Contract liability     $ 2,298,121 0  
Contract asset     0 $ 1,431,633  
Contract liability     $ 2,298,121    
Fixed Property, Including Intangibles          
Percentage of fee interest owned by Mesabi Land Trust in the lands subject to the Peters Lease     20.00%    
Base Overriding Royalties          
Revenue from Contract with Customer [Abstract]          
Base overriding royalties, first tier portion percentage     90.00%    
Base overriding royalties, first tier shipment ceiling (in million tons) | MT     4    
Base overriding royalties, second tier portion percentage     85.00%    
Base overriding royalties, second tier shipment ceiling (in million tons) | MT     2    
Base overriding royalties, third tier portion percentage     25.00%    
Base overriding royalties, third tier shipment threshold (in million tons) | MT     6    
Base overriding royalties, number of volume thresholds for transaction price | item     4    
Base overriding royalties, volume threshold for transaction price | MT     1