Condensed Statements of Income (Parenthetical)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Statements of Income [Abstract]
PER LIMITED PARTNERSHIP INTEREST, outstanding	46,280.3	46,280.3	46,280.3	46,280.3