Condensed Statements Of Income (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
REVENUES
Royalties	$ 5,009,358		$ 7,305,492		$ 9,717,225		$ 14,305,680
Interest and other income	19,553		23,354		45,866		53,711
TOTAL REVENUES	5,028,911		7,328,846		9,763,091		14,359,391
Costs and expenses	(1,011,200)		(1,050,233)		(2,054,534)		(2,111,697)
NET INCOME	$ 4,017,711		$ 6,278,613		$ 7,708,557		$ 12,247,694
Weighted-average shares outstanding	1,500,000		1,500,000		1,500,000		1,500,000
BASIC & DILUTED EARNINGS PER SHARE	$ 2.68		$ 4.19		$ 5.14		$ 8.17
Distributions declared per share	$ 2.50	[1]	$ 3.00	[2]	$ 4.75	[3]	$ 5.25	[4]

[1] $2.50 declared 6/17/2013 payable 7/31/2013

[2] $3.00 declared 6/6/2012 paid 7/31/2012

[3] $2.25 declared 3/8/2013 paid 4/30/2013 $2.50 declared 6/17/2013 payable 7/31/2013

[4] $2.25 declared 3/9/2012 paid 4/30/2012 $3.00 declared 6/6/2012 paid 7/31/2012