Condensed Statements Of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010
Cash flows from operating activities:
Cash received from royalties and rents	$ 11,575,918		$ 6,752,609
Cash paid to suppliers and employees	(1,336,202)		(1,224,493)
Interest and related premium/discount (paid) received	(2,987)		58,696
NET CASH PROVIDED BY OPERATING ACTIVITIES	10,236,729		5,586,812
Cash flows from investing activities:
U.S. Treasury securities purchased	(4,425,000)		(500,000)
U.S. Treasury securities matured	3,325,000		1,500,000
Expenditures for building and equipment	0		(11,303)
NET CASH (USED IN) PROVIDED BY INVESTING ACTIVITIES	(1,100,000)		988,697
Cash flows from financing activities:
Distributions paid	(9,000,000)		(6,900,000)
NET CASH USED IN FINANCING ACTIVITIES	(9,000,000)		(6,900,000)
Net increase (decrease) in cash and cash equivalents	136,729		(324,491)
Cash and cash equivalents at beginning of year	668,310	[1]	924,234
CASH AND CASH EQUIVALENTS AT JUNE 30	$ 805,039		$ 599,743

[1] Note: The balance sheet at December 31, 2010, has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.