Mortgage Revenue Bonds - Information Regarding MRBs Owned (Details) - USD ($)		Dec. 31, 2020		Dec. 31, 2019
Mortgage Revenue Bonds Held In Trust [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		$ 637,948,068		$ 648,445,150
Cumulative Unrealized Gain		130,520,576		95,795,445
Cumulative Unrealized Loss				(652,880)
Estimated Fair Value		768,468,644		743,587,715
Mortgage Revenue Bonds Held In Trust [Member] | Courtyard [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	10,061,161		10,147,686
Cumulative Unrealized Gain	[1]	2,487,317		1,602,534
Estimated Fair Value	[1]	12,548,478		11,750,220
Mortgage Revenue Bonds Held In Trust [Member] | Arbors at Hickory Ridge [Member] | TN [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[2]	10,910,733		11,056,825
Cumulative Unrealized Gain	[2]	2,704,295		1,934,146
Estimated Fair Value	[2]	13,615,028		12,990,971
Mortgage Revenue Bonds Held In Trust [Member] | Harmony Court Bakersfield [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	3,668,439		3,699,987
Cumulative Unrealized Gain	[1]	889,216		549,211
Estimated Fair Value	[1]	4,557,655		4,249,198
Mortgage Revenue Bonds Held In Trust [Member] | Harmony Terrace [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	6,791,096		6,849,214
Cumulative Unrealized Gain	[1]	1,724,350		1,121,262
Estimated Fair Value	[1]	8,515,446		7,970,476
Mortgage Revenue Bonds Held In Trust [Member] | Avistar at the Crest [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[2]	9,140,656		9,252,257
Cumulative Unrealized Gain	[2]	2,376,580		1,715,456
Estimated Fair Value	[2]	11,517,236		10,967,713
Mortgage Revenue Bonds Held In Trust [Member] | Avistar at the Oaks [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[2]	7,388,262		7,475,794
Cumulative Unrealized Gain	[2]	1,854,785		1,336,580
Estimated Fair Value	[2]	9,243,047		8,812,374
Mortgage Revenue Bonds Held In Trust [Member] | Las Palmas II [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	1,664,566		1,679,022
Cumulative Unrealized Gain	[1]	400,431		263,441
Estimated Fair Value	[1]	2,064,997		1,942,463
Mortgage Revenue Bonds Held In Trust [Member] | Seasons at Simi Valley [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	4,236,876		4,282,477
Cumulative Unrealized Gain	[1]	1,180,122		860,856
Estimated Fair Value	[1]	5,416,998		5,143,333
Mortgage Revenue Bonds Held In Trust [Member] | Avistar at the Parkway [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[3]	12,721,014		12,854,039
Cumulative Unrealized Gain	[3]	2,790,208		2,065,468
Estimated Fair Value	[3]	15,511,222		14,919,507
Mortgage Revenue Bonds Held In Trust [Member] | Sycamore Walk [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	3,517,919		3,559,011
Cumulative Unrealized Gain	[1]	888,485		567,713
Estimated Fair Value	[1]	4,406,404		4,126,724
Mortgage Revenue Bonds Held In Trust [Member] | Avistar in 09 [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[2]	6,379,479		6,455,058
Cumulative Unrealized Gain	[2]	1,601,535		1,125,239
Estimated Fair Value	[2]	7,981,014		7,580,297
Mortgage Revenue Bonds Held In Trust [Member] | Montecito at Williams Ranch Apartments [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[4]	7,626,287		7,681,146
Cumulative Unrealized Gain	[4]	2,350,276		1,580,303
Estimated Fair Value	[4]	9,976,563		9,261,449
Mortgage Revenue Bonds Held In Trust [Member] | Avistar on the Boulevard [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[2]	15,572,093		15,762,217
Cumulative Unrealized Gain	[2]	3,779,139		2,648,781
Estimated Fair Value	[2]	19,351,232		18,410,998
Mortgage Revenue Bonds Held In Trust [Member] | Montevista [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[4]	6,720,000
Cumulative Unrealized Gain	[4]	2,404,771
Estimated Fair Value	[4]	9,124,771
Mortgage Revenue Bonds Held In Trust [Member] | San Vicente [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	3,432,246		3,462,053
Cumulative Unrealized Gain	[1]	809,327		510,593
Estimated Fair Value	[1]	4,241,573		3,972,646
Mortgage Revenue Bonds Held In Trust [Member] | Avistar on the Hills [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[2]	5,058,171		5,118,097
Cumulative Unrealized Gain	[2]	1,292,513		938,032
Estimated Fair Value	[2]	6,350,684		6,056,129
Mortgage Revenue Bonds Held In Trust [Member] | Ocotillo Springs [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[4]	2,023,500
Cumulative Unrealized Gain	[4]	215,633
Estimated Fair Value	[4]	2,239,133
Mortgage Revenue Bonds Held In Trust [Member] | Bridle Ridge [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[5]	7,235,000		7,315,000
Cumulative Unrealized Gain	[5]	153,657		113,469
Estimated Fair Value	[5]	7,388,657		7,428,469
Mortgage Revenue Bonds Held In Trust [Member] | Seasons Lakewood [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	7,233,993		7,295,901
Cumulative Unrealized Gain	[1]	1,836,808		1,124,372
Estimated Fair Value	[1]	9,070,801		8,420,273
Mortgage Revenue Bonds Held In Trust [Member] | Brookstone [Member] | IL [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[5]	7,374,252		7,406,755
Cumulative Unrealized Gain	[5]	2,201,663		2,194,994
Estimated Fair Value	[5]	9,575,915		9,601,749
Mortgage Revenue Bonds Held In Trust [Member] | Seasons San Juan Capistrano [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	12,179,682		12,283,916
Cumulative Unrealized Gain	[1]	2,973,846		1,893,075
Estimated Fair Value	[1]	15,153,528		14,176,991
Mortgage Revenue Bonds Held In Trust [Member] | Bruton Apartments [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	17,674,167		17,807,768
Cumulative Unrealized Gain	[1]	3,792,253		3,534,702
Estimated Fair Value	[1]	21,466,420		21,342,470
Mortgage Revenue Bonds Held In Trust [Member] | Summerhill [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	6,316,993		6,371,318
Cumulative Unrealized Gain	[1]	1,470,689		797,228
Estimated Fair Value	[1]	7,787,682		7,168,546
Mortgage Revenue Bonds Held In Trust [Member] | Columbia Gardens [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	12,898,904		13,064,589
Cumulative Unrealized Gain	[1]	2,689,886		2,179,744
Estimated Fair Value	[1]	15,588,790		15,244,333
Mortgage Revenue Bonds Held In Trust [Member] | Concord at Gulfgate [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	18,796,773		18,975,786
Cumulative Unrealized Gain	[1]	4,888,537		3,572,995
Estimated Fair Value	[1]	23,685,310		22,548,781
Mortgage Revenue Bonds Held In Trust [Member] | The Village at Madera [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	3,034,084		3,060,177
Cumulative Unrealized Gain	[1]	735,450		454,240
Estimated Fair Value	[1]	3,769,534		3,514,417
Mortgage Revenue Bonds Held In Trust [Member] | Concord at Little York [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	13,168,029		13,293,436
Cumulative Unrealized Gain	[1]	3,543,909		2,624,054
Estimated Fair Value	[1]	16,711,938		15,917,490
Mortgage Revenue Bonds Held In Trust [Member] | Concord at Williamcrest [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	20,398,687		20,592,957
Cumulative Unrealized Gain	[1]	5,397,326		3,971,001
Estimated Fair Value	[1]	25,796,013		24,563,958
Mortgage Revenue Bonds Held In Trust [Member] | Vineyard Gardens | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[4]	3,969,173		3,995,000
Cumulative Unrealized Gain	[4]	1,226,058		815,213
Estimated Fair Value	[4]	5,195,231		4,810,213
Mortgage Revenue Bonds Held In Trust [Member] | Copper Gate Apartments [Member] | IN [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[2]	4,955,000		5,005,000
Cumulative Unrealized Gain	[2]	641,581		682,497
Estimated Fair Value	[2]	5,596,581		5,687,497
Mortgage Revenue Bonds Held In Trust [Member] | Cross Creek [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[5]	6,136,261		6,143,976
Cumulative Unrealized Gain	[5]	2,277,289		2,507,072
Estimated Fair Value	[5]	8,413,550		8,651,048
Mortgage Revenue Bonds Held In Trust [Member] | Decatur-Angle [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	22,270,729		22,455,747
Cumulative Unrealized Gain	[1]	5,600,721		4,198,200
Estimated Fair Value	[1]	27,871,450		26,653,947
Mortgage Revenue Bonds Held In Trust [Member] | Glenview Apartments [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[3]	4,483,154		4,533,958
Cumulative Unrealized Gain	[3]	1,010,425		757,900
Estimated Fair Value	[3]	5,493,579		5,291,858
Mortgage Revenue Bonds Held In Trust [Member] | Greens Property [Member] | Series A [Member] | NC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[2]	7,829,000		7,936,000
Cumulative Unrealized Gain	[2]	663,781		845,678
Estimated Fair Value	[2]	8,492,781		8,781,678
Mortgage Revenue Bonds Held In Trust [Member] | Companion at Thornhill Apartments [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	11,055,254		11,178,557
Cumulative Unrealized Gain	[1]	2,208,446		1,709,040
Estimated Fair Value	[1]	13,263,700		12,887,597
Mortgage Revenue Bonds Held In Trust [Member] | Harden Ranch [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[2]	6,621,823		6,700,868
Cumulative Unrealized Gain	[2]	1,606,690		1,281,980
Estimated Fair Value	[2]	8,228,513		7,982,848
Mortgage Revenue Bonds Held In Trust [Member] | Heritage Square [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[3]	10,579,057		10,695,037
Cumulative Unrealized Gain	[3]	2,095,871		1,455,672
Estimated Fair Value	[3]	12,674,928		12,150,709
Mortgage Revenue Bonds Held In Trust [Member] | Live 929 Apartments [Member] | MD [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		36,234,756	[4]	39,984,026	[6]
Cumulative Unrealized Loss	[6]			(280,711)
Estimated Fair Value		36,234,756	[4]	39,703,315	[6]
Mortgage Revenue Bonds Held In Trust [Member] | Gateway Village [Member] | NC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		2,600,000	[4]	2,600,000	[7]
Cumulative Unrealized Gain		136,612	[4]	509,901	[7]
Estimated Fair Value		2,736,612	[4]	3,109,901	[7]
Mortgage Revenue Bonds Held In Trust [Member] | Montclair Apartments [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[3]	2,428,775		2,456,298
Cumulative Unrealized Gain	[3]	572,671		446,558
Estimated Fair Value	[3]	3,001,446		2,902,856
Mortgage Revenue Bonds Held In Trust [Member] | Lynnhaven Apartments [Member] | NC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		3,450,000	[4]	3,450,000	[7]
Cumulative Unrealized Gain		178,960	[4]	393,686	[7]
Estimated Fair Value		3,628,960	[4]	3,843,686	[7]
Mortgage Revenue Bonds Held In Trust [Member] | Ohio Properties [Member] | Series A [Member] | OH [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[5]	13,724,000		13,857,000
Cumulative Unrealized Gain	[5]	61,243		48,813
Estimated Fair Value	[5]	13,785,243		13,905,813
Mortgage Revenue Bonds Held In Trust [Member] | Renaissance [Member] | Series A [Member] | LA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[3]	10,870,681		11,001,027
Cumulative Unrealized Gain	[3]	4,293,328		1,775,086
Estimated Fair Value	[3]	15,164,009		12,776,113
Mortgage Revenue Bonds Held In Trust [Member] | Village at Avalon [Member] | Series A [Member] | NM [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[8]	16,189,074		16,302,038
Cumulative Unrealized Gain	[8]	4,879,623		3,131,843
Estimated Fair Value	[8]	21,068,697		19,433,881
Mortgage Revenue Bonds Held In Trust [Member] | Runnymede [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[5]	9,805,000		9,925,000
Cumulative Unrealized Gain	[5]	105,634		80,343
Estimated Fair Value	[5]	9,910,634		10,005,343
Mortgage Revenue Bonds Held In Trust [Member] | Santa Fe Apartments [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[3]	2,942,370		2,975,713
Cumulative Unrealized Gain	[3]	724,678		540,988
Estimated Fair Value	[3]	3,667,048		3,516,701
Mortgage Revenue Bonds Held In Trust [Member] | Village at River's Edge [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	9,802,479		9,872,297
Cumulative Unrealized Gain	[1]	1,353,745		2,236,259
Estimated Fair Value	[1]	11,156,224		12,108,556
Mortgage Revenue Bonds Held In Trust [Member] | Silver Moon [Member] | Series A [Member] | NM [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[3]	7,697,891		7,762,116
Cumulative Unrealized Gain	[3]	1,995,694		1,166,748
Estimated Fair Value	[3]	9,693,585		8,928,864
Mortgage Revenue Bonds Held In Trust [Member] | Southpark [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[5]	11,462,172		11,548,337
Cumulative Unrealized Gain	[5]	1,917,286		2,334,262
Estimated Fair Value	[5]	13,379,458		13,882,599
Mortgage Revenue Bonds Held In Trust [Member] | The Palms at Premier Park [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[2]	18,619,081		18,838,478
Cumulative Unrealized Gain	[2]	2,906,879		2,799,411
Estimated Fair Value	[2]	21,525,960		21,637,889
Mortgage Revenue Bonds Held In Trust [Member] | Tyler Park Townhomes [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[2]	5,767,938		5,837,595
Cumulative Unrealized Gain	[2]	939,214		864,894
Estimated Fair Value	[2]	6,707,152		6,702,489
Mortgage Revenue Bonds Held In Trust [Member] | Avistar at Copperfield [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		13,815,817	[4]	13,945,681	[7]
Cumulative Unrealized Gain		3,189,896	[4]	2,356,231	[7]
Estimated Fair Value		17,005,713	[4]	16,301,912	[7]
Mortgage Revenue Bonds Held In Trust [Member] | Rosewood Townhomes [Member] | Series A [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[4]	9,259,206		9,280,000
Cumulative Unrealized Gain	[4]	578,247		316,916
Estimated Fair Value	[4]	9,837,453		9,596,916
Mortgage Revenue Bonds Held In Trust [Member] | Westside Village Market [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[2]	3,769,337		3,814,857
Cumulative Unrealized Gain	[2]	859,860		594,361
Estimated Fair Value	[2]	4,629,197		4,409,218
Mortgage Revenue Bonds Held In Trust [Member] | South Pointe Apartments [Member] | Series A [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[4]	21,551,600		21,600,000
Cumulative Unrealized Gain	[4]	1,345,919		835,005
Estimated Fair Value	[4]	22,897,519		22,435,005
Mortgage Revenue Bonds Held In Trust [Member] | Willow Run [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	12,720,560		12,884,191
Cumulative Unrealized Gain	[1]	2,650,995		2,100,598
Estimated Fair Value	[1]	15,371,555		14,984,789
Mortgage Revenue Bonds Held In Trust [Member] | Avistar at Wilcrest [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		5,235,915	[4]	5,285,131	[7]
Cumulative Unrealized Gain		1,084,347	[4]	806,523	[7]
Estimated Fair Value		6,320,262	[4]	6,091,654	[7]
Mortgage Revenue Bonds Held In Trust [Member] | Crossing at 1415 [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	7,331,821		7,405,406
Cumulative Unrealized Gain	[1]	1,810,458		1,229,438
Estimated Fair Value	[1]	9,142,279		8,634,844
Mortgage Revenue Bonds Held In Trust [Member] | Woodlynn Village [Member] | MN [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[5]	4,120,000		4,172,000
Cumulative Unrealized Gain	[5]	56,458		44,510
Estimated Fair Value	[5]	4,176,458		4,216,510
Mortgage Revenue Bonds Held In Trust [Member] | Avistar at Wood Hollow [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		39,756,184	[4]	40,129,878	[7]
Cumulative Unrealized Gain		8,703,609	[4]	6,450,704	[7]
Estimated Fair Value		48,459,793	[4]	46,580,582	[7]
Mortgage Revenue Bonds Held In Trust [Member] | Heights at 515 [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	6,712,409		6,779,777
Cumulative Unrealized Gain	[1]	1,600,836		1,154,387
Estimated Fair Value	[1]	8,313,245		7,934,164
Mortgage Revenue Bonds Held In Trust [Member] | 15 West Apartments [Member] | WA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	9,604,680		9,673,117
Cumulative Unrealized Gain	[1]	3,257,826		2,287,904
Estimated Fair Value	[1]	12,862,506		11,961,021
Mortgage Revenue Bonds Held In Trust [Member] | Esperanza at Palo Alto [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	19,218,417		19,356,959
Cumulative Unrealized Gain	[1]	5,955,488		4,111,518
Estimated Fair Value	[1]	25,173,905		23,468,477
Mortgage Revenue Bonds Held In Trust [Member] | Oaks at Georgetown [Member] | Series A [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[1]	12,135,392		12,239,247
Cumulative Unrealized Gain	[1]	2,597,201		1,645,817
Estimated Fair Value	[1]	14,732,593		13,885,064
Mortgage Revenue Bonds Held In Trust [Member] | Provision Center 2014-1 [Member] | TN [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[6]			10,022,352
Cumulative Unrealized Loss	[6]			(372,169)
Estimated Fair Value	[6]			9,650,183
Mortgage Revenue Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		24,472,905		27,267,010
Cumulative Unrealized Gain		1,490,936		2,742,740
Estimated Fair Value		25,963,841		30,009,750
Mortgage Revenue Bonds [Member] | Avistar at the Crest [Member] | Series B [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		735,974		740,876
Cumulative Unrealized Gain		144,746		94,819
Estimated Fair Value		880,720		835,695
Mortgage Revenue Bonds [Member] | Avistar at the Oaks [Member] | Series B [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		538,723		542,170
Cumulative Unrealized Gain		100,668		65,455
Estimated Fair Value		639,391		607,625
Mortgage Revenue Bonds [Member] | Avistar at the Parkway [Member] | Series B [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		123,973		124,305
Cumulative Unrealized Gain		43,650		38,045
Estimated Fair Value		167,623		162,350
Mortgage Revenue Bonds [Member] | Avistar in 09 [Member] | Series B [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		444,398		447,241
Cumulative Unrealized Gain		83,042		53,995
Estimated Fair Value		527,440		501,236
Mortgage Revenue Bonds [Member] | Avistar on the Boulevard [Member] | Series B [Member] | TX [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		437,318		440,231
Cumulative Unrealized Gain		82,718		53,056
Estimated Fair Value		520,036		493,287
Mortgage Revenue Bonds [Member] | Montevista [Member] | Series A and B [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances				13,200,000
Cumulative Unrealized Gain				1,654,870
Estimated Fair Value				14,854,870
Mortgage Revenue Bonds [Member] | Greens Property [Member] | Series B [Member] | NC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		925,607		930,016
Cumulative Unrealized Gain		107,347		142,265
Estimated Fair Value		1,032,954		1,072,281
Mortgage Revenue Bonds [Member] | Ohio Properties [Member] | Series B [Member] | OH [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		3,485,690		3,504,171
Cumulative Unrealized Gain		13,578		10,363
Estimated Fair Value		3,499,268		3,514,534
Mortgage Revenue Bonds [Member] | Rosewood Townhomes [Member] | Series B [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		469,781		470,000
Cumulative Unrealized Gain		2,549		1,685
Estimated Fair Value		472,330		471,685
Mortgage Revenue Bonds [Member] | South Pointe Apartments [Member] | Series B [Member] | SC [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		1,099,487		1,100,000
Cumulative Unrealized Gain		5,967		2,952
Estimated Fair Value		1,105,454		1,102,952
Mortgage Revenue Bonds [Member] | Solano Vista [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		2,665,000
Cumulative Unrealized Gain		891,612
Estimated Fair Value		3,556,612
Mortgage Revenue Bonds [Member] | Solano Vista [Member] | Series A and B [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances				5,768,000
Cumulative Unrealized Gain				625,235
Estimated Fair Value				$ 6,393,235
Mortgage Revenue Bonds [Member] | Arby Road Apartments [Member] | Series A [Member] | NV [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		7,385,000
Cumulative Unrealized Gain		15,059
Estimated Fair Value		7,400,059
Mortgage Revenue Bonds [Member] | Provision Center 2014-1 [Member] | TN [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		6,161,954
Estimated Fair Value		$ 6,161,954

[1]   MRB owned by ATAX TEBS IV, LLC (M45 TEBS), see Note 16

[2]   MRB owned by ATAX TEBS II, LLC (M31 TEBS), see Note 16

[3]   MRB owned by ATAX TEBS III, LLC (M33 TEBS), see Note 16

[4] MRB held by Mizuho Capital Markets, LLC in a debt financing transaction, see Note 16

[5]   MRB owned by ATAX TEBS I, LLC (M24 TEBS), see Note 16

[6] As of the date presented, the MRB had been in a cumulative unrealized loss position for less than 12 consecutive months

[7]    MRB held by Deutsche Bank in a debt financing transaction, see Note 16

[8] MRB held by Morgan Stanley in a debt financing transaction, see Note 16