NATURE OF BUSINESS AND ORGANIZATION - SCF (Details) - USD ($)	6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Royalties received	$ 16,056,417	$ 8,723,576
Interest received	51,515	12,571
Expenses paid	(735,803)	(670,622)
Net cash from operating activities	15,372,129	8,065,525
Maturities of U.S. Government securities	24,168,903	82,628
Purchases of U.S. Government securities	(18,273,425)	(1,993,386)
Net cash from (used for) investing activities	5,895,478	(1,910,758)
Distributions to unitholders	(21,385,616)	(9,052,807)
Net change in cash and cash equivalents	(118,009)	(2,898,040)
Cash and cash equivalents, beginning of period	314,835	13,695,168
Cash and cash equivalents, end of period	196,826	10,797,128
Net income	25,187,303	18,468,879
Increase in accrued income receivable	(6,820,424)	(6,175,819)
Increase in contract asset	(2,907,643)	(1,993,037)
Increase in prepaid expense	(97,625)	(86,177)
Decrease in accrued expenses	10,518	(48,906)
Decrease in contract liability		(2,099,415)
Distributions declared and payable	2,886,402	2,099,202
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income		1,993,037
Increase in contract asset		(1,993,037)
Decrease in deferred royalty revenue		2,099,415
Decrease in contract liability		(2,099,415)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Royalties received		8,723,576
Interest received		12,571
Expenses paid		(670,622)
Net cash from operating activities		8,065,525
Maturities of U.S. Government securities		82,628
Purchases of U.S. Government securities		(1,993,386)
Net cash from (used for) investing activities		(1,910,758)
Distributions to unitholders		(9,052,807)
Net change in cash and cash equivalents		(2,898,040)
Cash and cash equivalents, beginning of period	$ 314,835	13,695,168
Cash and cash equivalents, end of period		10,797,128
Net income		16,475,842
Increase in accrued income receivable		(6,175,819)
Increase in prepaid expense		(86,177)
Decrease in accrued expenses		(48,906)
Decrease in deferred royalty revenue		(2,099,415)
Distributions declared and payable		$ 2,099,202