Condensed Statements of Cash Flows (USD $)	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Cash flows from operating activities
Royalties received	$ 1,146,901	$ 1,165,358
Interest received	553	541
Expenses paid	(221,513)	(369,025)
Net cash provided by operating activities	925,941	796,874
Cash flows from investing activities
Maturities of U.S. Government Securities	83,000	35,000
Purchases of U.S. Government Securities	(82,380)
Net cash provided by investing activities	620	35,000
Cash flow used for financing activity
Distributions to Unitholders	(6,428,805)	(9,971,208)
Net change in cash and cash equivalents	(5,502,244)	(9,139,334)
Cash and cash equivalents, beginning of year	6,727,461	10,253,474
Cash and cash equivalents, end of quarter	1,225,217	1,114,140
Reconciliation of net income to net cash provided by operating activities
Net income	2,202,389	3,369,892
Increase in accrued income receivable	(1,381,353)	(2,527,547)
Decrease in prepaid expenses	1,842	3,469
Increase (decrease) in accrued expenses	103,063	(48,940)
Net cash provided by operating activities	925,941	796,874
Non Cash Financing Activity
Distributions declared	$ 1,049,601	$ 852,801