CONDENSED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (DEFICIT) (USD $)	Total	Assignees [Member]	General Partner [Member]	Series Fifteen [Member]	Series Fifteen [Member] Assignees [Member]	Series Fifteen [Member] General Partner [Member]	Series Sixteen [Member]	Series Sixteen [Member] Assignees [Member]	Series Sixteen [Member] General Partner [Member]	Series Seventeen [Member]	Series Seventeen [Member] Assignees [Member]	Series Seventeen [Member] General Partner [Member]	Series Eighteen [Member]	Series Eighteen [Member] Assignees [Member]	Series Eighteen [Member] General Partner [Member]	Series Nineteen [Member]	Series Nineteen [Member] Assignees [Member]	Series Nineteen [Member] General Partner [Member]
Partners' capital (deficit) at Mar. 31, 2012	$ (19,577,591)	$ (17,526,537)	$ (2,051,054)	$ (3,608,167)	$ (3,249,896)	$ (358,271)	$ (8,215,722)	$ (7,666,956)	$ (548,766)	$ (6,695,530)	$ (6,207,797)	$ (487,733)	$ (4,870,038)	$ (4,511,110)	$ (358,928)	$ 3,811,866	$ 4,109,222	$ (297,356)
Net income (loss)	1,851,513	1,832,999	18,514	(114,559)	(113,413)	(1,146)	(67,293)	(66,620)	(673)	160,746	159,139	1,607	672,693	665,966	6,727	1,199,926	1,187,927	11,999
Partners' capital (deficit) at Dec. 31, 2012	(17,726,078)	(15,693,538)	(2,032,540)	(3,722,726)	(3,363,309)	(359,417)	(8,283,015)	(7,733,576)	(549,439)	(6,534,784)	(6,048,658)	(486,126)	(4,197,345)	(3,845,144)	(352,201)	5,011,792	5,297,149	(285,357)
Partners' capital (deficit) at Sep. 30, 2012
Net income (loss)	1,114,740			(21,050)			15,512			300,489			797,566			22,223
Partners' capital (deficit) at Dec. 31, 2012	$ (17,726,078)			$ (3,722,726)			$ (8,283,015)			$ (6,534,784)			$ (4,197,345)			$ 5,011,792