Condensed Statements of Cash Flows (USD $)	3 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Cash flows from operating activities
Royalties received	$ 1,165,358	$ 842,499
Interest received	541	1,735
Expenses paid	(369,025)	(268,763)
Net cash provided by operating activities	796,874	575,471
Cash flows from investing activities
Maturities of U.S. Government Securities	35,000	217,000
Purchases of U.S. Government Securities		(217,104)
Net cash provided by (used for) investing activities	35,000	(104)
Cash flow used for financing activity
Distributions to Unitholders	(9,971,208)	(8,528,006)
Net change in cash and cash equivalents	(9,139,334)	(7,952,639)
Cash and cash equivalents, beginning of year	10,253,474	8,693,691
Cash and cash equivalents, end of quarter	1,114,140	741,052
Reconciliation of net income to net cash provided by operating activities
Net income	3,369,892	3,063,261
Increase in accrued income receivable	(2,527,547)	(2,433,814)
Decrease in prepaid expenses	3,469	1,146
Decrease in accrued expenses	(48,940)	(55,122)
Net cash provided by operating activities	796,874	575,471
Non Cash Financing Activity
Distributions declared	$ 852,801	$ 656,001