Investments in Bonds (Details) - USD ($)		Mar. 31, 2017	Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Value, held in trust		$ 27,814,516	$ 90,016,872
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		676,378,829	554,678,736
Cumulative Unrealized Gain, held in trust		56,270,094	37,814,237
Cumulative Unrealized Loss, held in trust		(1,557,543)	(2,298,794)
Estimated Fair Value, held in trust		731,091,380	590,194,179
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]	11,432,508	11,461,719
Cumulative Unrealized Gain, held in trust	[1]	1,100,249	891,274
Estimated Fair Value, held in trust	[1]	12,532,757	12,352,993
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	[2]	10,041,165	10,041,924
Cumulative Unrealized Gain, held in trust	[2]	797,435	685,576
Estimated Fair Value, held in trust	[2]	10,838,600	10,727,500
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	[3]	8,606,000	8,639,000
Cumulative Unrealized Gain, held in trust	[3]	1,010,956	899,694
Estimated Fair Value, held in trust	[3]	9,616,956	9,538,694
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	[3]	5,024,000	5,039,000
Cumulative Unrealized Gain, held in trust	[3]	417,085	338,556
Estimated Fair Value, held in trust	[3]	5,441,085	5,377,556
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	[3]	7,460,242	7,462,678
Cumulative Unrealized Gain, held in trust	[3]	1,689,582	1,457,340
Estimated Fair Value, held in trust	[3]	9,149,824	8,920,018
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	5,145,000
Cumulative Unrealized Gain, held in trust	[1]	597,695	528,855
Estimated Fair Value, held in trust	[1]	5,742,695	5,673,855
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	[3]	6,365,000	6,365,000
Cumulative Unrealized Gain, held in trust	[3]	645,602	500,162
Estimated Fair Value, held in trust	[3]	7,010,602	6,865,162
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	[2]	40,656,400	40,687,425
Cumulative Unrealized Gain, held in trust	[2]	4,474,464	3,587,993
Estimated Fair Value, held in trust	[2]	45,130,864	44,275,418
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	[3]	4,310,000	4,310,000
Cumulative Unrealized Gain, held in trust	[3]	387,771	294,976
Estimated Fair Value, held in trust	[3]	4,697,771	4,604,976
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	[2]	18,135,889	18,145,000
Cumulative Unrealized Gain, held in trust	[2]	2,262,691	349,886
Estimated Fair Value, held in trust	[2]	20,398,580	18,494,886
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	[3]	7,500,000	7,535,000
Cumulative Unrealized Gain, held in trust	[3]	676,500	517,881
Estimated Fair Value, held in trust	[3]	8,176,500	8,052,881
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	[2]	15,211,629	15,214,223
Cumulative Unrealized Loss, held in trust	[2]	(689,295)	(927,030)
Estimated Fair Value, held in trust	[2]	14,522,334	14,287,193
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	[3]	6,126,494	6,122,312
Cumulative Unrealized Gain, held in trust	[3]	2,774,745	2,655,730
Estimated Fair Value, held in trust	[3]	8,901,239	8,778,042
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]	19,375,997	19,826,716
Cumulative Unrealized Gain, held in trust	[1]	2,368,538	1,784,386
Estimated Fair Value, held in trust	[1]	21,744,535	21,611,102
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	[2]	22,912,234	22,950,214
Cumulative Unrealized Gain, held in trust	[2]	1,541,021
Cumulative Unrealized Loss, held in trust	[2]		(290,985)
Estimated Fair Value, held in trust	[2]	24,453,255	22,659,229
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	[2]	11,483,057	11,500,000
Cumulative Unrealized Gain, held in trust	[2]	642,679	645,552
Estimated Fair Value, held in trust	[2]	12,125,736	12,145,552
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	[2]	15,211,458	15,214,085
Cumulative Unrealized Loss, held in trust	[2]	(682,914)	(917,852)
Estimated Fair Value, held in trust	[2]	14,528,544	14,296,233
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	[3]	10,250,000	10,250,000
Cumulative Unrealized Gain, held in trust	[3]	1,387,645	774,285
Estimated Fair Value, held in trust	[3]	11,637,645	11,024,285
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	[3]	11,770,930	11,751,861
Cumulative Unrealized Gain, held in trust	[3]	3,605,964	3,286,203
Estimated Fair Value, held in trust	[3]	15,376,894	15,038,064
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	[2]	9,840,735	9,850,000
Cumulative Unrealized Gain, held in trust	[2]	1,352,502	1,584,281
Estimated Fair Value, held in trust	[2]	11,193,237	11,434,281
Mortgage Revenue Bonds Held In Trust [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	[2]	16,458,000
Cumulative Unrealized Gain, held in trust	[2]	110,929
Estimated Fair Value, held in trust	[2]	16,568,929
Mortgage Revenue Bonds Held In Trust [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	[2]	5,727,000
Cumulative Unrealized Gain, held in trust	[2]	32,990
Estimated Fair Value, held in trust	[2]	5,759,990
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	[2]	14,300,000	14,300,000
Cumulative Unrealized Gain, held in trust	[2]	225,094
Estimated Fair Value, held in trust	[2]	14,525,094	14,300,000
Mortgage Revenue Bonds Held In Trust [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	[2]	3,465,000
Cumulative Unrealized Gain, held in trust	[2]	55,226
Estimated Fair Value, held in trust	[2]	3,520,226
Mortgage Revenue Bonds Held In Trust [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	[2]	5,320,000
Cumulative Unrealized Loss, held in trust	[2]	(30,004)
Estimated Fair Value, held in trust	[2]	5,289,996
Mortgage Revenue Bonds Held In Trust [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	[2]	12,610,000
Cumulative Unrealized Gain, held in trust	[2]	162,961
Estimated Fair Value, held in trust	[2]	12,772,961
Mortgage Revenue Bonds Held In Trust [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	[2]	18,949,000
Cumulative Unrealized Loss, held in trust	[2]	(117,692)
Estimated Fair Value, held in trust	[2]	18,831,308
Mortgage Revenue Bonds Held In Trust [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	[2]	9,795,000
Cumulative Unrealized Gain, held in trust	[2]	140,099
Estimated Fair Value, held in trust	[2]	9,935,099
Mortgage Revenue Bonds Held In Trust [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	[2]	4,804,000
Cumulative Unrealized Loss, held in trust	[2]	(31,581)
Estimated Fair Value, held in trust	[2]	4,772,419
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	[2]	17,842,000	17,842,000
Cumulative Unrealized Loss, held in trust	[2]	(6,057)
Estimated Fair Value, held in trust	[2]	17,835,943	17,842,000
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]	4,659,536	4,670,000
Cumulative Unrealized Gain, held in trust	[4]	243,342	132,402
Estimated Fair Value, held in trust	[4]	4,902,878	4,802,402
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]	6,896,254	6,912,535
Cumulative Unrealized Gain, held in trust	[1]	458,986	369,738
Estimated Fair Value, held in trust	[1]	7,355,240	7,282,273
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]	2,524,331	2,530,000
Cumulative Unrealized Gain, held in trust	[4]	182,019	108,608
Estimated Fair Value, held in trust	[4]	2,706,350	2,638,608
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]	9,821,495	9,844,994
Cumulative Unrealized Gain, held in trust	[1]	646,280	589,023
Estimated Fair Value, held in trust	[1]	10,467,775	10,434,017
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]	3,058,132	3,065,000
Cumulative Unrealized Gain, held in trust	[4]	298,645	177,093
Estimated Fair Value, held in trust	[4]	3,356,777	3,242,093
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]	9,526,850	9,549,644
Cumulative Unrealized Gain, held in trust	[1]	747,812	753,267
Estimated Fair Value, held in trust	[1]	10,274,662	10,302,911
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	[2]	4,376,000	4,376,000
Cumulative Unrealized Gain, held in trust	[2]	373,438	308,335
Estimated Fair Value, held in trust	[2]	4,749,438	4,684,335
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	[2]	3,632,000	3,632,000
Cumulative Unrealized Gain, held in trust	[2]	185,900	130,431
Estimated Fair Value, held in trust	[2]	3,817,900	3,762,431
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]	7,691,162	7,709,040
Cumulative Unrealized Gain, held in trust	[1]	708,946	563,138
Estimated Fair Value, held in trust	[1]	8,400,108	8,272,178
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]	3,927,375	3,936,750
Cumulative Unrealized Gain, held in trust	[1]	152,881	102,641
Estimated Fair Value, held in trust	[1]	4,080,256	4,039,391
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]	912,068
Cumulative Unrealized Loss, held in trust	[4]		(78,749)
Estimated Fair Value, held in trust	[4]	14,212,068	13,221,251
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]	6,009,773	6,024,120
Cumulative Unrealized Gain, held in trust	[1]	314,519	237,582
Estimated Fair Value, held in trust	[1]	6,324,292	6,261,702
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]	6,641,021	6,656,458
Cumulative Unrealized Gain, held in trust	[1]	482,819	359,562
Estimated Fair Value, held in trust	[1]	7,123,840	7,016,020
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]	16,230,017	16,268,850
Cumulative Unrealized Gain, held in trust	[1]	1,590,214	1,283,272
Estimated Fair Value, held in trust	[1]	17,820,231	17,552,122
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]	5,313,805	5,326,157
Cumulative Unrealized Gain, held in trust	[1]	420,499	423,496
Estimated Fair Value, held in trust	[1]	5,734,304	5,749,653
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]	11,321,742	11,348,364
Cumulative Unrealized Gain, held in trust	[4]	1,657,217	826,369
Estimated Fair Value, held in trust	[4]	12,978,959	12,174,733
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]	8,189,000	8,210,000
Cumulative Unrealized Gain, held in trust	[1]	990,540	844,585
Estimated Fair Value, held in trust	[1]	9,179,540	9,054,585
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]	7,920,141	7,933,259
Cumulative Unrealized Gain, held in trust	[4]	626,949	465,382
Estimated Fair Value, held in trust	[4]	8,547,090	8,398,641
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	[2]	19,185,000	19,185,000
Cumulative Unrealized Gain, held in trust	[2]	2,002,365	1,200,246
Estimated Fair Value, held in trust	[2]	21,187,365	20,385,246
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	[3]	14,191,000	14,215,000
Cumulative Unrealized Gain, held in trust	[3]	2,605,877	2,327,468
Estimated Fair Value, held in trust	[3]	16,796,877	16,542,468
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	[2]	13,440,000	13,440,000
Cumulative Unrealized Gain, held in trust	[2]	1,402,751	1,044,752
Estimated Fair Value, held in trust	[2]	14,842,751	14,484,752
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	[2]	20,820,000	20,820,000
Cumulative Unrealized Gain, held in trust	[2]	1,953,644	1,302,534
Estimated Fair Value, held in trust	[2]	22,773,644	22,122,534
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]	11,137,303	11,161,330
Cumulative Unrealized Gain, held in trust	[4]	899,415	905,455
Estimated Fair Value, held in trust	[4]	12,036,718	12,066,785
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at Copperfield [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	10,000,000
Cumulative Unrealized Gain, held in trust	[2]	981,390
Estimated Fair Value, held in trust	[2]	10,981,390
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	[2]	7,590,000	7,590,000
Cumulative Unrealized Gain, held in trust	[2]	91,901
Cumulative Unrealized Loss, held in trust	[2]		(45,555)
Estimated Fair Value, held in trust	[2]	7,681,901	7,544,445
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at Wilcrest [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	3,775,000
Cumulative Unrealized Gain, held in trust	[2]	288,734
Estimated Fair Value, held in trust	[2]	4,063,734
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	[2]	6,435,000	6,435,000
Cumulative Unrealized Gain, held in trust	[2]	362,774
Cumulative Unrealized Loss, held in trust	[2]		(38,623)
Estimated Fair Value, held in trust	[2]	6,797,774	6,396,377
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at Wood Hollow [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	[2]	31,850,000
Cumulative Unrealized Gain, held in trust	[2]	2,663,590
Estimated Fair Value, held in trust	[2]	34,513,590
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]	24,483,475	24,529,580
Cumulative Unrealized Gain, held in trust	[4]	1,389,153	917,720
Estimated Fair Value, held in trust	[4]	25,872,628	25,447,300
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]	26,304,679	26,356,498
Cumulative Unrealized Gain, held in trust	[4]	2,175,003	1,658,508
Estimated Fair Value, held in trust	[4]	28,479,682	28,015,006
Mortgage Revenue Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		26,335,066	89,510,867
Cumulative Unrealized Gain, held in trust		1,496,584	869,807
Cumulative Unrealized Loss, held in trust		(17,134)	(363,802)
Estimated Fair Value, held in trust		27,814,516	90,016,872
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		956,476	957,627
Cumulative Unrealized Gain, held in trust		13,545	41,820
Estimated Fair Value, held in trust		970,021	999,447
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		752,296	753,201
Cumulative Unrealized Gain, held in trust		76,170	64,228
Estimated Fair Value, held in trust		828,466	817,429
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	1,944,000
Cumulative Unrealized Gain, held in trust		20,065	27,727
Estimated Fair Value, held in trust		1,964,065	1,971,727
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	1,815,000
Cumulative Unrealized Loss, held in trust		(17,134)	(64,432)
Estimated Fair Value, held in trust		1,797,866	1,750,568
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		550,200	550,836
Cumulative Unrealized Gain, held in trust		56,026	47,231
Estimated Fair Value, held in trust		606,226	598,067
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 Gain, held in trust		6,657
Cumulative Unrealized Loss, held in trust			(3,341)
Estimated Fair Value, held in trust		131,657	121,659
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		453,865	454,390
Cumulative Unrealized Gain, held in trust		46,217	38,961
Estimated Fair Value, held in trust		500,082	493,351
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		447,016	447,554
Cumulative Unrealized Gain, held in trust		45,261	38,165
Estimated Fair Value, held in trust		492,277	485,719
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		939,743	940,479
Cumulative Unrealized Gain, held in trust		130,989	118,216
Estimated Fair Value, held in trust		1,070,732	1,058,695
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		3,546,470	3,549,780
Cumulative Unrealized Gain, held in trust		505,116	449,068
Estimated Fair Value, held in trust		4,051,586	3,998,848
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at Copperfield [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		4,000,000
Cumulative Unrealized Gain, held in trust		151,942
Estimated Fair Value, held in trust		4,151,942
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	335,000
Cumulative Unrealized Gain, held in trust		1,319
Cumulative Unrealized Loss, held in trust			(2,614)
Estimated Fair Value, held in trust		336,319	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	510,000
Cumulative Unrealized Gain, held in trust		2,008
Cumulative Unrealized Loss, held in trust			(3,977)
Estimated Fair Value, held in trust		512,008	$ 506,023
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at Wilcrest [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		1,550,000
Cumulative Unrealized Gain, held in trust		14,359
Estimated Fair Value, held in trust		1,564,359
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at Wood Hollow [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust		8,410,000
Cumulative Unrealized Gain, held in trust		426,910
Estimated Fair Value, held in trust		$ 8,836,910

[1] MRBs owned by ATAX TEBS II, LLC (M31 TEBS), Note 15

[2] MRBs held by Deutsche Bank in a secured financing transaction, Note 15

[3] MRBs owned by ATAX TEBS I, LLC (M24 TEBS), Note 15

[4] MRBs owned by ATAX TEBS III, LLC (M33 TEBS), Note 15