Condensed Statements of Income (Parenthetical)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Statements of Income [Abstract]
PER LIMITED PARTNERSHIP INTEREST, outstanding	46,280.3	46,280.3	46,280.3	46,280.3