Investments in Bonds (Details) - USD ($)		Dec. 31, 2016	Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Value, held in trust		$ 90,016,872	$ 47,366,656
Mortgage Revenue Bonds Held In Trust [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		554,678,736	484,817,254
Cumulative Unrealized Gain, held in trust		37,814,237	51,499,227
Cumulative Unrealized Loss, held in trust		(2,298,794)
Estimated Fair Value, held in trust		590,194,179	536,316,481
Mortgage Revenue Bonds Held In Trust [Member] | Arbors at Hickory Ridge [Member] | TN [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	11,461,719	11,565,657
Cumulative Unrealized Gain, held in trust	[1]	891,274	1,767,508
Estimated Fair Value, held in trust	[1]	12,352,993	13,333,165
Mortgage Revenue Bonds Held In Trust [Member] | Ashley Square [Member] | IA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	5,039,000	5,099,000
Cumulative Unrealized Gain, held in trust	[2]	338,556	508,163
Estimated Fair Value, held in trust	[2]	5,377,556	5,607,163
Mortgage Revenue Bonds Held In Trust [Member] | Bella Vista [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	6,365,000	6,430,000
Cumulative Unrealized Gain, held in trust	[2]	500,162	766,135
Estimated Fair Value, held in trust	[2]	6,865,162	7,196,135
Mortgage Revenue Bonds Held In Trust [Member] | Bridle Ridge [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	7,535,000	7,595,000
Cumulative Unrealized Gain, held in trust	[2]	517,881	817,222
Estimated Fair Value, held in trust	[2]	8,052,881	8,412,222
Mortgage Revenue Bonds Held In Trust [Member] | Brookstone [Member] | IL [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	7,462,678	7,468,668
Cumulative Unrealized Gain, held in trust	[2]	1,457,340	1,436,203
Estimated Fair Value, held in trust	[2]	8,920,018	8,904,871
Mortgage Revenue Bonds Held In Trust [Member] | Bruton Apts [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	18,145,000	18,145,000
Cumulative Unrealized Gain, held in trust	[3]	349,886	1,901,839
Estimated Fair Value, held in trust	[3]	18,494,886	20,046,839
Mortgage Revenue Bonds Held In Trust [Member] | Columbia Gardens [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	15,214,223	15,224,597
Cumulative Unrealized Loss, held in trust	[3]	(927,030)
Estimated Fair Value, held in trust	[3]	14,287,193	15,224,597
Mortgage Revenue Bonds Held In Trust [Member] | Copper Gate [Member] | IN [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	5,145,000	5,185,000
Cumulative Unrealized Gain, held in trust	[1]	528,855	616,341
Estimated Fair Value, held in trust	[1]	5,673,855	5,801,341
Mortgage Revenue Bonds Held In Trust [Member] | Cross Creek [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	6,122,312	6,101,605
Cumulative Unrealized Gain, held in trust	[2]	2,655,730	2,932,689
Estimated Fair Value, held in trust	[2]	8,778,042	9,034,294
Mortgage Revenue Bonds Held In Trust [Member] | Decatur-Angle [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	22,950,214	23,000,000
Cumulative Unrealized Gain, held in trust	[3]		1,582,083
Cumulative Unrealized Loss, held in trust	[3]	(290,985)
Estimated Fair Value, held in trust	[3]	22,659,229	24,582,083
Mortgage Revenue Bonds Held In Trust [Member] | Companion At Thornhill Apts [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	11,500,000
Cumulative Unrealized Gain, held in trust	[3]	645,552
Estimated Fair Value, held in trust	[3]	12,145,552
Mortgage Revenue Bonds Held In Trust [Member] | Lake Forest [Member] | FL [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	8,639,000	8,766,000
Cumulative Unrealized Gain, held in trust	[2]	899,694	1,177,745
Estimated Fair Value, held in trust	[2]	9,538,694	9,943,745
Mortgage Revenue Bonds Held In Trust [Member] | Live 929 Apartments [Member] | MD [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	40,687,425	40,801,557
Cumulative Unrealized Gain, held in trust	[3]	3,587,993	5,829,855
Estimated Fair Value, held in trust	[3]	44,275,418	46,631,412
Mortgage Revenue Bonds Held In Trust [Member] | Pro Nova [Member] | TN [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	10,041,924	19,379,489
Cumulative Unrealized Gain, held in trust	[3]	685,576	1,182,900
Estimated Fair Value, held in trust	[3]	10,727,500	20,562,389
Mortgage Revenue Bonds Held In Trust [Member] | Runnymede [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	10,250,000	10,350,000
Cumulative Unrealized Gain, held in trust	[2]	774,285	1,600,938
Estimated Fair Value, held in trust	[2]	11,024,285	11,950,938
Mortgage Revenue Bonds Held In Trust [Member] | Southpark [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	11,751,861	11,799,874
Cumulative Unrealized Gain, held in trust	[2]	3,286,203	3,990,882
Estimated Fair Value, held in trust	[2]	15,038,064	15,790,756
Mortgage Revenue Bonds Held In Trust [Member] | The Palms at Premier Park [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	19,826,716	20,001,272
Cumulative Unrealized Gain, held in trust	[1]	1,784,386	2,505,091
Estimated Fair Value, held in trust	[1]	21,611,102	22,506,363
Mortgage Revenue Bonds Held In Trust [Member] | Willow Run [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	15,214,085	15,224,591
Cumulative Unrealized Loss, held in trust	[3]	(917,852)
Estimated Fair Value, held in trust	[3]	14,296,233	15,224,591
Mortgage Revenue Bonds Held In Trust [Member] | Woodlynn Village [Member] | MN [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	4,310,000	4,351,000
Cumulative Unrealized Gain, held in trust	[2]	294,976	466,471
Estimated Fair Value, held in trust	[2]	4,604,976	4,817,471
Mortgage Revenue Bonds Held In Trust [Member] | 15 West Apartments [Member] | WA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	9,850,000
Cumulative Unrealized Gain, held in trust	[3]	1,584,281
Estimated Fair Value, held in trust	[3]	11,434,281
Mortgage Revenue Bonds Held In Trust [Member] | Series A and B [Member] | Harmony Terrace [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	14,300,000
Estimated Fair Value, held in trust	[3]	14,300,000
Mortgage Revenue Bonds Held In Trust [Member] | Series A and B [Member] | Oaks at Georgetown [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	17,842,000
Estimated Fair Value, held in trust	[3]	17,842,000
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at Chase Hill - [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	9,844,994	9,935,552
Cumulative Unrealized Gain, held in trust	[1]	589,023	1,133,024
Estimated Fair Value, held in trust	[1]	10,434,017	11,068,576
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at the Crest [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	9,549,644	9,637,485
Cumulative Unrealized Gain, held in trust	[1]	753,267	1,301,224
Estimated Fair Value, held in trust	[1]	10,302,911	10,938,709
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at the Oaks [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	7,709,040	7,777,936
Cumulative Unrealized Gain, held in trust	[1]	563,138	840,159
Estimated Fair Value, held in trust	[1]	8,272,178	8,618,095
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Seasons at Simi Valley [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	4,376,000
Cumulative Unrealized Gain, held in trust	[3]	308,335
Estimated Fair Value, held in trust	[3]	4,684,335
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at the Parkway [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[4]	13,300,000	13,300,000
Cumulative Unrealized Gain, held in trust	[4]		330,251
Cumulative Unrealized Loss, held in trust	[4]	(78,749)
Estimated Fair Value, held in trust	[4]	13,221,251	13,630,251
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Sycamore Walk [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	3,632,000
Cumulative Unrealized Gain, held in trust	[3]	130,431
Estimated Fair Value, held in trust	[3]	3,762,431
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar in 09 [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	6,656,458	6,715,948
Cumulative Unrealized Gain, held in trust	[1]	359,562	725,445
Estimated Fair Value, held in trust	[1]	7,016,020	7,441,393
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar on the Boulevard [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	16,268,850	16,418,497
Cumulative Unrealized Gain, held in trust	[1]	1,283,272	1,872,323
Estimated Fair Value, held in trust	[1]	17,552,122	18,290,820
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar on the Hills [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	5,326,157	5,373,756
Cumulative Unrealized Gain, held in trust	[1]	423,496	693,096
Estimated Fair Value, held in trust	[1]	5,749,653	6,066,852
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Concord at Gulfgate [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	19,185,000	17,060,000
Cumulative Unrealized Gain, held in trust	[3]	1,200,246	852,612
Estimated Fair Value, held in trust	[3]	20,385,246	17,912,612
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Concord at Little York [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	13,440,000	12,480,000
Cumulative Unrealized Gain, held in trust	[3]	1,044,752	688,441
Estimated Fair Value, held in trust	[3]	14,484,752	13,168,441
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Concord at Williamcrest [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	20,820,000	18,020,000
Cumulative Unrealized Gain, held in trust	[3]	1,302,534	1,182,543
Estimated Fair Value, held in trust	[3]	22,122,534	19,202,543
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Glenview Apartments [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[4]	4,670,000	4,670,000
Cumulative Unrealized Gain, held in trust	[4]	132,402	210,572
Estimated Fair Value, held in trust	[4]	4,802,402	4,880,572
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Greens of Pine Glen [Member] | NC [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	8,210,000	8,294,000
Cumulative Unrealized Gain, held in trust	[1]	844,585	1,138,270
Estimated Fair Value, held in trust	[1]	9,054,585	9,432,270
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Harden Ranch [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	6,912,535	6,960,000
Cumulative Unrealized Gain, held in trust	[1]	369,738	668,981
Estimated Fair Value, held in trust	[1]	7,282,273	7,628,981
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Heritage Square [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[4]	11,161,330	11,185,000
Cumulative Unrealized Gain, held in trust	[4]	905,455	273,488
Estimated Fair Value, held in trust	[4]	12,066,785	11,458,488
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Montclair Apts [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[4]	2,530,000	2,530,000
Cumulative Unrealized Gain, held in trust	[4]	108,608	114,079
Estimated Fair Value, held in trust	[4]	2,638,608	2,644,079
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Ohio Properties [Member] | OH [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	14,215,000	14,311,000
Cumulative Unrealized Gain, held in trust	[2]	2,327,468	2,690,867
Estimated Fair Value, held in trust	[2]	16,542,468	17,001,867
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Rennaisance [Member] | LA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[4]	11,348,364	11,450,959
Cumulative Unrealized Gain, held in trust	[4]	826,369	1,233,077
Estimated Fair Value, held in trust	[4]	12,174,733	12,684,036
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Santa Fe Apts [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[4]	3,065,000	3,065,000
Cumulative Unrealized Gain, held in trust	[4]	177,093	154,067
Estimated Fair Value, held in trust	[4]	3,242,093	3,219,067
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Silver Moon [Member] | NM [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[4]	7,933,259	7,983,811
Cumulative Unrealized Gain, held in trust	[4]	465,382	1,246,349
Estimated Fair Value, held in trust	[4]	8,398,641	9,230,160
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Tyler Park Apartments [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	6,024,120	6,075,000
Cumulative Unrealized Gain, held in trust	[1]	237,582	487,209
Estimated Fair Value, held in trust	[1]	6,261,702	6,562,209
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Westside Village Market [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[1]	3,936,750	3,970,000
Cumulative Unrealized Gain, held in trust	[1]	102,641	202,340
Estimated Fair Value, held in trust	[1]	4,039,391	4,172,340
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Crossing at 1415 [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	7,590,000
Cumulative Unrealized Loss, held in trust	[3]	(45,555)
Estimated Fair Value, held in trust	[3]	7,544,445
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Heights at 515 [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[3]	6,435,000
Cumulative Unrealized Loss, held in trust	[3]	(38,623)
Estimated Fair Value, held in trust	[3]	6,396,377
Mortgage Revenue Bonds Held In Trust [Member] | Series B [Member] | Vantage at Harlingen [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[4]	24,529,580	24,575,000
Cumulative Unrealized Gain, held in trust	[4]	917,720	1,765,139
Estimated Fair Value, held in trust	[4]	25,447,300	26,340,139
Mortgage Revenue Bonds Held In Trust [Member] | Series B [Member] | Vantage at Judson [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[4]	26,356,498	26,540,000
Cumulative Unrealized Gain, held in trust	[4]	1,658,508	2,613,606
Estimated Fair Value, held in trust	[4]	28,015,006	29,153,606
Mortgage Revenue Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		89,510,867	45,502,220
Cumulative Unrealized Gain, held in trust		869,807	1,907,499
Cumulative Unrealized Loss, held in trust		(363,802)	(43,063)
Estimated Fair Value, held in trust		90,016,872	47,366,656
Mortgage Revenue Bonds [Member] | Seasons at Simi Valley [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			6,320,000
Cumulative Unrealized Gain, held in trust			404,110
Estimated Fair Value, held in trust			6,724,110
Mortgage Revenue Bonds [Member] | Sycamore Walk [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			5,447,000
Estimated Fair Value, held in trust			5,447,000
Mortgage Revenue Bonds [Member] | Crossing at 1415 [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			7,925,000
Cumulative Unrealized Gain, held in trust			214,091
Estimated Fair Value, held in trust			8,139,091
Mortgage Revenue Bonds [Member] | Heights at 515 [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			6,945,000
Cumulative Unrealized Gain, held in trust			185,268
Estimated Fair Value, held in trust			7,130,268
Mortgage Revenue Bonds [Member] | Series A and B [Member] | Courtyard [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		16,458,000
Estimated Fair Value, held in trust		16,458,000
Mortgage Revenue Bonds [Member] | Series A and B [Member] | Harmony Court Bakersfield [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		5,727,000
Cumulative Unrealized Gain, held in trust		29,252
Estimated Fair Value, held in trust		5,756,252
Mortgage Revenue Bonds [Member] | Series A and B [Member] | Las Palmas II [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		3,465,000
Cumulative Unrealized Gain, held in trust		15,139
Estimated Fair Value, held in trust		3,480,139
Mortgage Revenue Bonds [Member] | Series A and B [Member] | San Vicente [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		5,320,000
Cumulative Unrealized Loss, held in trust		(30,019)
Estimated Fair Value, held in trust		5,289,981
Mortgage Revenue Bonds [Member] | Series A and B [Member] | Seasons Lakewood [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		12,610,000
Estimated Fair Value, held in trust		12,610,000
Mortgage Revenue Bonds [Member] | Series A and B [Member] | Seasons San Juan Capistrano [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		18,949,000
Estimated Fair Value, held in trust		18,949,000
Mortgage Revenue Bonds [Member] | Series A and B [Member] | Summerhill [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		9,795,000
Cumulative Unrealized Loss, held in trust		(174,982)
Estimated Fair Value, held in trust		9,620,018
Mortgage Revenue Bonds [Member] | Series A and B [Member] | The Village at Madera [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		4,804,000
Cumulative Unrealized Loss, held in trust		(84,437)
Estimated Fair Value, held in trust		4,719,563
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at Chase Hill - [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		957,627	961,981
Cumulative Unrealized Gain, held in trust		41,820	109,878
Estimated Fair Value, held in trust		999,447	1,071,859
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at the Crest [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		753,201	756,626
Cumulative Unrealized Gain, held in trust		64,228	86,428
Estimated Fair Value, held in trust		817,429	843,054
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at the Oaks [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		550,836	553,244
Cumulative Unrealized Gain, held in trust		47,231	63,533
Estimated Fair Value, held in trust		598,067	616,777
Mortgage Revenue Bonds [Member] | Series B [Member] | Seasons at Simi Valley [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		1,944,000
Cumulative Unrealized Gain, held in trust		27,727
Estimated Fair Value, held in trust		1,971,727
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at the Parkway [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		125,000	125,000
Cumulative Unrealized Loss, held in trust		(3,341)	(979)
Estimated Fair Value, held in trust		121,659	124,021
Mortgage Revenue Bonds [Member] | Series B [Member] | Sycamore Walk [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		1,815,000
Cumulative Unrealized Loss, held in trust		(64,432)
Estimated Fair Value, held in trust		1,750,568
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar in 09 [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		454,390	456,376
Cumulative Unrealized Gain, held in trust		38,961	52,409
Estimated Fair Value, held in trust		493,351	508,785
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar on the Boulevard [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		447,554	449,589
Cumulative Unrealized Gain, held in trust		38,165	51,356
Estimated Fair Value, held in trust		485,719	500,945
Mortgage Revenue Bonds [Member] | Series B [Member] | Concord at Gulfgate [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			2,125,000
Cumulative Unrealized Gain, held in trust			76,802
Estimated Fair Value, held in trust			2,201,802
Mortgage Revenue Bonds [Member] | Series B [Member] | Concord at Little York [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			960,000
Cumulative Unrealized Loss, held in trust			(6,711)
Estimated Fair Value, held in trust			953,289
Mortgage Revenue Bonds [Member] | Series B [Member] | Concord at Williamcrest [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			2,800,000
Cumulative Unrealized Loss, held in trust			(19,573)
Estimated Fair Value, held in trust			2,780,427
Mortgage Revenue Bonds [Member] | Series B [Member] | Glenview Apartments [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			2,053,000
Cumulative Unrealized Loss, held in trust			(7,329)
Estimated Fair Value, held in trust			2,045,671
Mortgage Revenue Bonds [Member] | Series B [Member] | Greens of Pine Glen [Member] | NC [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		940,479	943,214
Cumulative Unrealized Gain, held in trust		118,216	142,442
Estimated Fair Value, held in trust		1,058,695	1,085,656
Mortgage Revenue Bonds [Member] | Series B [Member] | Heritage Square [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			520,000
Cumulative Unrealized Gain, held in trust			6,185
Estimated Fair Value, held in trust			526,185
Mortgage Revenue Bonds [Member] | Series B [Member] | Montclair Apts [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			928,000
Cumulative Unrealized Loss, held in trust			(2,506)
Estimated Fair Value, held in trust			925,494
Mortgage Revenue Bonds [Member] | Series B [Member] | Ohio Properties [Member] | OH [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		3,549,780	3,562,190
Cumulative Unrealized Gain, held in trust		449,068	514,997
Estimated Fair Value, held in trust		3,998,848	4,077,187
Mortgage Revenue Bonds [Member] | Series B [Member] | Santa Fe Apts [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			1,671,000
Cumulative Unrealized Loss, held in trust			(5,965)
Estimated Fair Value, held in trust			$ 1,665,035
Mortgage Revenue Bonds [Member] | Series B [Member] | Crossing at 1415 [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		335,000
Cumulative Unrealized Loss, held in trust		(2,614)
Estimated Fair Value, held in trust		332,386
Mortgage Revenue Bonds [Member] | Series B [Member] | Heights at 515 [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		510,000
Cumulative Unrealized Loss, held in trust		(3,977)
Estimated Fair Value, held in trust		$ 506,023

[1] Bonds owned by ATAX TEBS II, LLC (M31 TEBS), see Note 17

[2] Bonds owned by ATAX TEBS I, LLC (M24 TEBS), see Note 17

[3] Bond held by Deutsche Bank in a secured financing transaction, see Note 17

[4] Bonds owned by ATAX TEBS III, LLC (M33 TEBS), see Note 17