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ROYALTY AGREEMENT, UNALLOCATED RESERVE AND DISTRIBUTIONS (Details) - USD ($)
3 Months Ended
Apr. 12, 2019
Apr. 30, 2019
Apr. 30, 2018
Jan. 31, 2019
UNALLOCATED RESERVE AND DISTRIBUTIONS        
Distribution declared per unit (Note 3) (in dollars per unit) $ 0.89 $ 0.8900 $ 0.4500  
Unallocated Cash and Securities portion of Unallocated Reserve        
Cash and U.S. Government securities   $ 17,139,622   $ 33,004,122
Distribution payable   (11,676,809)   (18,236,814)
Unallocated cash and U.S. Government securities   5,462,813   $ 14,767,308
Reconciliation of Trust's Unallocated Reserve        
Beginning Balance   16,805,692 $ 10,606,678  
Net income   4,910,288 6,315,848  
Distributions declared   (11,676,809) (5,904,005)  
Ending Balance   $ 10,039,171 $ 11,018,521  
Distribution declared per unit   $ 0.8900 $ 0.4500  
Unallocated Reserve        
Reconciliation of Trust's Unallocated Reserve        
Beginning Balance   $ 16,805,689 $ 10,606,675  
Net income   4,910,288 6,315,848  
Distributions declared   (11,676,809) (5,904,005)  
Ending Balance   10,039,168 11,018,518  
Trust Corpus        
Reconciliation of Trust's Unallocated Reserve        
Beginning Balance   3 3  
Ending Balance   $ 3 $ 3