ORGANIZATION (Details) - USD ($)	Sep. 04, 1993	Sep. 30, 2019	Mar. 31, 2019
Organization And Summary Of Significant Accounting Policies [Line Items]
Units of limited partnership interest, authorized	20,000,000	22,000,000	22,000,000
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10	$ 10
Limited Partners' Capital Account, Units Issued		21,996,102	21,996,102
Limited Partners' Capital Account, Units Outstanding		21,695,581	21,695,581
Limited Partners Capital Account Additional Units Registered For Sale	2,000,000
Series 15
Organization And Summary Of Significant Accounting Policies [Line Items]
Units of limited partnership interest, authorized		22,000,000	22,000,000
Beneficial assignee certificate, par value (in dollars per share)		$ 10	$ 10
Limited Partners' Capital Account, Units Issued		3,870,500	3,870,500
Limited Partners Capital Accounts Units Issued Value		$ 38,705,000
Limited Partners' Capital Account, Units Outstanding		3,810,700	3,810,700
Series 16
Organization And Summary Of Significant Accounting Policies [Line Items]
Units of limited partnership interest, authorized		22,000,000	22,000,000
Beneficial assignee certificate, par value (in dollars per share)		$ 10	$ 10
Limited Partners' Capital Account, Units Issued		5,429,402	5,429,402
Limited Partners Capital Accounts Units Issued Value		$ 54,293,000
Limited Partners' Capital Account, Units Outstanding		5,332,500	5,332,500
Series 17
Organization And Summary Of Significant Accounting Policies [Line Items]
Units of limited partnership interest, authorized		22,000,000	22,000,000
Beneficial assignee certificate, par value (in dollars per share)		$ 10	$ 10
Limited Partners' Capital Account, Units Issued		5,000,000	5,000,000
Limited Partners Capital Accounts Units Issued Value		$ 50,000,000
Limited Partners' Capital Account, Units Outstanding		4,938,247	4,938,247
Series 18
Organization And Summary Of Significant Accounting Policies [Line Items]
Units of limited partnership interest, authorized		22,000,000	22,000,000
Beneficial assignee certificate, par value (in dollars per share)		$ 10	$ 10
Limited Partners' Capital Account, Units Issued		3,616,200	3,616,200
Limited Partners Capital Accounts Units Issued Value		$ 36,162,000
Limited Partners' Capital Account, Units Outstanding		3,558,134	3,558,134
Series 19
Organization And Summary Of Significant Accounting Policies [Line Items]
Units of limited partnership interest, authorized		22,000,000	22,000,000
Beneficial assignee certificate, par value (in dollars per share)		$ 10	$ 10
Limited Partners' Capital Account, Units Issued		4,080,000	4,080,000
Limited Partners Capital Accounts Units Issued Value		$ 40,800,000
Limited Partners' Capital Account, Units Outstanding		4,056,000	4,056,000