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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Effect of adoption SCF (Details) - USD ($) | 12 Months Ended
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Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Royalties received | $ 46,705,036 | $ 30,470,480 | $ 13,702,276
Interest received | 248,667 | 86,616 | 5,541
Expenses paid | (1,457,039) | (1,047,221) | (1,124,467)
Net cash from operating activities | 45,496,664 | 29,509,875 | 12,583,350
Maturities of U.S. Government securities | 81,835,668 | 37,636,412 | 5,740,659
Purchases of U.S. Government securities | (90,260,269) | (60,977,805) |
Net cash used for investing activities | (8,324,861) | (23,341,393) | 5,740,659
Distributions to unitholders | (36,604,828) | (19,548,815) | (7,216,006)
Net change in cash and cash equivalents | 566,975 | (13,380,333) | 11,108,003
Cash and cash equivalents, beginning of period | 314,835 | 13,695,168 | 2,587,165
Cash and cash equivalents, end of period | 881,810 | 314,835 | 13,695,168
Reconciliation of net income to net cash from operating activities |  |  |
Net income | 45,559,044 | 33,423,425 | 9,763,771
Decrease (increase) in accrued income receivable | (382,969) | (1,911,046) | 933,101
Decrease (increase) in contract asset | 42,907 | 72,142 | (150,659)
Decrease (increase) in prepaid expense | 168 | (1,032) | 1,322
Increase (decrease) in accrued expenses | 277,514 | 25,801 | (63,600)
Increase (decrease) in contract liability |  | (2,099,415) | 2,099,415
Distributions declared and payable | 18,236,814 | 15,481,612 | 1,836,801
Restatement Adjustment | Accounting Standards Update 2014-09 [Member] |  |  |
Reconciliation of net income to net cash from operating activities |  |  |
Net income |  | (72,142) | 150,659
Decrease (increase) in contract asset |  | 72,142 | (150,659)
Increase (decrease) in deferred royalty revenue |  | 2,099,415 | (2,099,415)
Increase (decrease) in contract liability |  | (2,099,415) | 2,099,415
As Previously Reported |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Royalties received |  | 30,470,480 | 13,702,276
Interest received |  | 86,616 | 5,541
Expenses paid |  | (1,047,221) | (1,124,467)
Net cash from operating activities |  | 29,509,875 | 12,583,350
Maturities of U.S. Government securities |  | 37,636,412 | 5,740,659
Purchases of U.S. Government securities |  | (60,977,805) |
Net cash used for investing activities |  | (23,341,393) | 5,740,659
Distributions to unitholders |  | (19,548,815) | (7,216,006)
Net change in cash and cash equivalents |  | (13,380,333) | 11,108,003
Cash and cash equivalents, beginning of period | $ 314,835 | 13,695,168 | 2,587,165
Cash and cash equivalents, end of period |  | 314,835 | 13,695,168
Reconciliation of net income to net cash from operating activities |  |  |
Net income |  | 33,495,567 | 9,613,112
Decrease (increase) in accrued income receivable |  | (1,911,046) | 933,101
Decrease (increase) in prepaid expense |  | (1,032) | 1,322
Increase (decrease) in accrued expenses |  | 25,801 | (63,600)
Increase (decrease) in deferred royalty revenue |  | (2,099,415) | 2,099,415
Distributions declared and payable |  | $ 15,481,612 | $ 1,836,801

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