CONDENSED BALANCE SHEETS [Parenthetical] (USD $)	Dec. 31, 2011	Mar. 31, 2011
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	20,000,000	20,000,000
Units of limited partnership interest, issued	18,679,738	18,679,738
Units of limited partnership interest, outstanding	18,678,038	18,678,038
Series Seven [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	20,000,000	20,000,000
Units of limited partnership interest, issued	1,036,100	1,036,100
Units of limited partnership interest, outstanding	1,036,100	1,036,100
Series Nine [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	20,000,000	20,000,000
Units of limited partnership interest, issued	4,178,029	4,178,029
Units of limited partnership interest, outstanding	4,177,329	4,177,329
Series Ten [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	20,000,000	20,000,000
Units of limited partnership interest, issued	2,428,925	2,428,925
Units of limited partnership interest, outstanding	2,427,925	2,427,925
Series Eleven [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	20,000,000	20,000,000
Units of limited partnership interest, issued	2,489,599	2,489,599
Units of limited partnership interest, outstanding	2,489,599	2,489,599
Series Twelve [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	20,000,000	20,000,000
Units of limited partnership interest, issued	2,972,795	2,972,795
Units of limited partnership interest, outstanding	2,972,795	2,972,795
Series Fourteen [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	20,000,000	20,000,000
Units of limited partnership interest, issued	5,574,290	5,574,290
Units of limited partnership interest, outstanding	5,574,290	5,574,290