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ROYALTY AGREEMENT, UNALLOCATED RESERVE AND DISTRIBUTIONS (Details) - USD ($)		3 Months Ended
	Apr. 13, 2018	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018
UNALLOCATED RESERVE AND DISTRIBUTIONS
Distribution declared or paid (in dollars per unit)	$ 0.45	$ 0.4500	$ 0.5500
Unallocated Cash and Securities portion of Unallocated Reserve
Cash and U.S. Government securities		$ 11,345,274		$ 24,112,286
Distribution payable		(5,904,005)		(15,481,612)
Unallocated cash and U.S. Government securities		5,441,269		$ 8,630,674
Reconciliation of Trust's Unallocated Reserve
Unallocated Reserve at the beginning of the period		10,606,675
Net income		6,315,848	$ 4,471,925
Distributions declared		(5,904,005)
Unallocated Reserve at the end of the period		$ 11,018,518

X

- Definition

Represents the amount of currency on hand as well as demand deposits with banks or financial institutions and U.S. Government securities.

+ References

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- Definition

Represents the cash distributions per unit declared and paid by the entity during the period for all units of stock.

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- Definition

The aggregate amount of distributions paid and declared in the period.

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- Definition

Represents the maintained level of unallocated reserve in the form of cash and U.S. Government securities.

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No definition available.

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit, consisting primarily of accrued income receivable representing royalties not yet received by the Trust but anticipated to be received in future periods.

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No definition available.

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- Definition

Sum of the carrying values as of the balance sheet date of (a) interest payable on all forms of debt, including trade payables, that has been incurred, and (b) dividends declared but unpaid on equity securities issued by the entity and outstanding (also includes dividends collected on behalf of another owner of securities that are being held by the entity). Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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