SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue (Details)			1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 29, 2021 USD ($)	Oct. 08, 2021 $ / shares	Jul. 31, 2021 USD ($)	Oct. 31, 2021 USD ($) $ / shares	Oct. 31, 2020 USD ($) $ / shares	Oct. 31, 2021 USD ($) item contract MT $ / shares	Oct. 31, 2020 USD ($) $ / shares	Jan. 31, 2021 USD ($)
Revenue from Contract with Customer [Abstract]
Royalty Revenue				$ 15,836,180	$ 5,736,151	$ 52,982,383	$ 15,090,006
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
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				8,491,074		$ 8,491,074		$ 249,477
Number of customer contracts | contract						1
Net contract asset				551,370		$ 551,370		177,251
Contract asset				551,370		551,370		239,132
Contract liability			$ 5,966,182	$ 0		$ 0		$ 61,881
Distributions declared per unit (in dollars per unit) | $ / shares		$ 1.42		$ 1.4200	$ 0.3600	$ 2.4000	$ 0.9700
Base Overriding Royalties
Revenue from Contract with Customer [Abstract]
Royalty Revenue				$ 9,644,501	$ 3,142,465	$ 31,929,119	$ 8,499,261
Bonus Royalties
Revenue from Contract with Customer [Abstract]
Royalty Revenue				5,981,907	2,448,652	20,465,070	6,271,940
Fee Royalties
Revenue from Contract with Customer [Abstract]
Royalty Revenue				$ 209,772	$ 145,034	$ 588,194	$ 318,805