CONDENSED BALANCE SHEETS [Parenthetical] (USD $)	Dec. 31, 2012	Mar. 31, 2012
Beneficial assignee certificate, par value (in dollars per unit)	$ 10	$ 10
Limited partners capital account, units authorized	20,000,000	20,000,000
Limited partners capital account, units issued	18,679,738	18,679,738
Limited partners capital account, units outstanding	18,671,338	18,671,338
Series Seven [Member]
Beneficial assignee certificate, par value (in dollars per unit)	$ 10	$ 10
Limited partners capital account, units authorized	20,000,000	20,000,000
Limited partners capital account, units issued	1,036,100	1,036,100
Limited partners capital account, units outstanding	1,036,100	1,036,100
Series Nine [Member]
Beneficial assignee certificate, par value (in dollars per unit)	$ 10	$ 10
Limited partners capital account, units authorized	20,000,000	20,000,000
Limited partners capital account, units issued	4,178,029	4,178,029
Limited partners capital account, units outstanding	4,176,329	4,176,329
Series Ten [Member]
Beneficial assignee certificate, par value (in dollars per unit)	$ 10	$ 10
Limited partners capital account, units authorized	20,000,000	20,000,000
Limited partners capital account, units issued	2,428,925	2,428,925
Limited partners capital account, units outstanding	2,423,225	2,423,225
Series Eleven [Member]
Beneficial assignee certificate, par value (in dollars per unit)	$ 10	$ 10
Limited partners capital account, units authorized	20,000,000	20,000,000
Limited partners capital account, units issued	2,489,599	2,489,599
Limited partners capital account, units outstanding	2,489,599	2,489,599
Series Twelve [Member]
Beneficial assignee certificate, par value (in dollars per unit)	$ 10	$ 10
Limited partners capital account, units authorized	20,000,000	20,000,000
Limited partners capital account, units issued	2,972,795	2,972,795
Limited partners capital account, units outstanding	2,971,795	2,971,795
Series Fourteen [Member]
Beneficial assignee certificate, par value (in dollars per unit)	$ 10	$ 10
Limited partners capital account, units authorized	20,000,000	20,000,000
Limited partners capital account, units issued	5,574,290	5,574,290
Limited partners capital account, units outstanding	5,574,290	5,574,290