CONDENSED BALANCE SHEETS [Parenthetical] - $ / shares	Jun. 30, 2015	Mar. 31, 2015	Sep. 04, 1993
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10	$ 10
Limited Partners Capital Account, Units Authorized	22,000,000	22,000,000
Limited Partners' Capital Account, Units Issued	21,996,102	21,996,102
Limited Partners Capital Account, Units Outstanding	21,936,787	21,936,787
Series Fifteen [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Limited Partners Capital Account, Units Authorized	22,000,000	22,000,000
Limited Partners' Capital Account, Units Issued	3,870,500	3,870,500
Limited Partners Capital Account, Units Outstanding	3,858,400	3,858,400
Series Sixteen [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Limited Partners Capital Account, Units Authorized	22,000,000	22,000,000
Limited Partners' Capital Account, Units Issued	5,429,402	5,429,402
Limited Partners Capital Account, Units Outstanding	5,411,800	5,411,800
Series Seventeen [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Limited Partners Capital Account, Units Authorized	22,000,000	22,000,000
Limited Partners' Capital Account, Units Issued	5,000,000	5,000,000
Limited Partners Capital Account, Units Outstanding	4,980,687	4,980,687
Series Eighteen [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Limited Partners Capital Account, Units Authorized	22,000,000	22,000,000
Limited Partners' Capital Account, Units Issued	3,616,200	3,616,200
Limited Partners Capital Account, Units Outstanding	3,612,200	3,612,200
Series Nineteen [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Limited Partners Capital Account, Units Authorized	22,000,000	22,000,000
Limited Partners' Capital Account, Units Issued	4,080,000	4,080,000
Limited Partners Capital Account, Units Outstanding	4,073,700	4,073,700