Condensed Statements Of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Cash received from royalties and rents	$ 9,316,691	$ 9,084,387
Cash paid to suppliers and employees	(1,534,971)	(1,341,554)
Interest received	17,575	40,948
NET CASH PROVIDED BY OPERATING ACTIVITIES	7,799,295	7,783,781
Cash flows from investing activities:
United States Treasury securities purchased	(4,000,000)	(2,675,000)
United States Treasury securities matured	3,600,000	6,025,000
Expenditures for building and equipment		(7,641)
NET CASH (USED IN) PROVIDED BY INVESTING ACTIVITIES	(400,000)	3,342,359
Cash flows from financing activities:
Distributions paid	(7,350,000)	(11,250,000)
NET CASH USED IN FINANCING ACTIVITIES	(7,350,000)	(11,250,000)
Net increase (decrease) in cash and cash equivalents	49,295	(123,860)
Cash and cash equivalents at beginning of year	712,197	643,431
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 761,492	$ 519,571