Condensed Statements Of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Cash received from royalties and rents	$ 14,399,694	$ 14,124,615
Cash paid to suppliers and employees	(3,921,034)	(3,210,162)
Interest received	28,237	59,015
NET CASH PROVIDED BY OPERATING ACTIVITIES	10,506,897	10,973,468
Cash flows from investing activities:
United States Treasury securities purchased	(4,500,000)	(3,525,000)
United States Treasury securities matured	5,300,000	7,675,000
Expenditures for building and equipment		(23,206)
NET CASH PROVIDED BY INVESTING ACTIVITIES	800,000	4,126,794
Cash flows from financing activities:
Distributions paid	(11,100,000)	(15,000,000)
NET CASH USED IN FINANCING ACTIVITIES	(11,100,000)	(15,000,000)
Net increase in cash and cash equivalents	206,897	100,262
Cash and cash equivalents at beginning of year	712,197	643,431
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 919,094	$ 743,693