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Investments in Mortgage Revenue Bonds - Schedule of investments in MRBs (Details) - USD ($)
Mar. 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 $ 645,764,076 $ 648,445,150
Cumulative Unrealized Gain 88,885,224 95,795,445
Cumulative Unrealized Loss (403,464) (652,880)
Estimated Fair Value 734,245,836 743,587,715
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] 10,126,458 10,147,686
Cumulative Unrealized Gain [1] 1,428,563 1,602,534
Estimated Fair Value [1] 11,555,021 11,750,220
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 [2] 4,521,529 4,533,958
Cumulative Unrealized Gain [2] 687,871 757,900
Estimated Fair Value [2] 5,209,400 5,291,858
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] 3,692,247 3,699,987
Cumulative Unrealized Gain [1] 487,054 549,211
Estimated Fair Value [1] 4,179,301 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] 6,834,955 6,849,214
Cumulative Unrealized Gain [1] 1,002,038 1,121,262
Estimated Fair Value [1] 7,836,993 7,970,476
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 [3] 6,681,530 6,700,868
Cumulative Unrealized Gain [3] 1,094,025 1,281,980
Estimated Fair Value [3] 7,775,555 7,982,848
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] 1,675,475 1,679,022
Cumulative Unrealized Gain [1] 234,810 263,441
Estimated Fair Value [1] 1,910,285 1,942,463
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 [2] 2,449,565 2,456,298
Cumulative Unrealized Gain [2] 415,776 446,558
Estimated Fair Value [2] 2,865,341 2,902,856
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 7,667,712 [4] 7,681,146 [5]
Cumulative Unrealized Gain 1,457,424 [4] 1,580,303 [5]
Estimated Fair Value 9,125,136 [4] 9,261,449 [5]
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] 3,454,740 3,462,053
Cumulative Unrealized Gain [1] 452,745 510,593
Estimated Fair Value [1] 3,907,485 3,972,646
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 [2] 2,967,556 2,975,713
Cumulative Unrealized Gain [2] 503,697 540,988
Estimated Fair Value [2] 3,471,253 3,516,701
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] 4,271,321 4,282,477
Cumulative Unrealized Gain [1] 818,274 860,856
Estimated Fair Value [1] 5,089,595 5,143,333
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] 7,280,713 7,295,901
Cumulative Unrealized Gain [1] 999,919 1,124,372
Estimated Fair Value [1] 8,280,632 8,420,273
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] 12,258,343 12,283,916
Cumulative Unrealized Gain [1] 1,683,537 1,893,075
Estimated Fair Value [1] 13,941,880 14,176,991
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] 6,357,990 6,371,318
Cumulative Unrealized Gain [1] 809,791 797,228
Estimated Fair Value [1] 7,167,781 7,168,546
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] 3,548,939 3,559,011
Cumulative Unrealized Gain [1] 527,404 567,713
Estimated Fair Value [1] 4,076,343 4,126,724
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] 3,053,775 3,060,177
Cumulative Unrealized Gain [1] 402,832 454,240
Estimated Fair Value [1] 3,456,607 3,514,417
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 [3] 5,820,554 5,837,595
Cumulative Unrealized Gain [3] 685,637 864,894
Estimated Fair Value [3] 6,506,191 6,702,489
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 3,990,400 [4] 3,995,000 [5]
Cumulative Unrealized Gain 751,127 [4] 815,213 [5]
Estimated Fair Value 4,741,527 [4] 4,810,213 [5]
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 [3] 3,803,721 3,814,857
Cumulative Unrealized Gain [3] 590,032 594,361
Estimated Fair Value [3] 4,393,753 4,409,218
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 [6] 7,399,317 7,406,755
Cumulative Unrealized Gain [6] 1,923,740 2,194,994
Estimated Fair Value [6] 9,323,057 9,601,749
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 [3] 5,005,000 5,005,000
Cumulative Unrealized Gain [3] 565,018 682,497
Estimated Fair Value [3] 5,570,018 5,687,497
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 [2] 10,969,168 11,001,027
Cumulative Unrealized Gain [2] 1,774,107 1,775,086
Estimated Fair Value [2] 12,743,275 12,776,113
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 [7] 39,907,484 [4] 39,984,026 [5]
Cumulative Unrealized Loss [7] (403,464) [4] (280,711) [5]
Estimated Fair Value [7] 39,504,020 [4] 39,703,315 [5]
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 [6] 4,172,000 4,172,000
Cumulative Unrealized Gain [6] 10,156 44,510
Estimated Fair Value [6] 4,182,156 4,216,510
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 [8] 2,600,000 2,600,000
Cumulative Unrealized Gain [8] 431,554 509,901
Estimated Fair Value [8] 3,031,554 3,109,901
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 [3] 7,910,000 7,936,000
Cumulative Unrealized Gain [3] 702,514 845,678
Estimated Fair Value [3] 8,612,514 8,781,678
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 [8] 3,450,000 3,450,000
Cumulative Unrealized Gain [8] 462,437 393,686
Estimated Fair Value [8] 3,912,437 3,843,686
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 [2] 7,746,418 7,762,116
Cumulative Unrealized Gain [2] 1,311,816 1,166,748
Estimated Fair Value [2] 9,058,234 8,928,864
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 16,274,407 [9] 16,302,038 [10]
Cumulative Unrealized Gain 3,132,378 [9] 3,131,843 [10]
Estimated Fair Value 19,406,785 [9] 19,433,881 [10]
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 [6] 13,823,998 13,857,000
Cumulative Unrealized Gain [6] 46,555 48,813
Estimated Fair Value [6] 13,870,553 13,905,813
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 [6] 7,275,000 7,315,000
Cumulative Unrealized Gain [6] 54,595 113,469
Estimated Fair Value [6] 7,329,595 7,428,469
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] 13,023,898 13,064,589
Cumulative Unrealized Gain [1] 1,930,568 2,179,744
Estimated Fair Value [1] 14,954,466 15,244,333
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] 11,148,397 11,178,557
Cumulative Unrealized Gain [1] 1,421,140 1,709,040
Estimated Fair Value [1] 12,569,537 12,887,597
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 [6] 6,142,795 6,143,976
Cumulative Unrealized Gain [6] 2,367,804 2,507,072
Estimated Fair Value [6] 8,510,599 8,651,048
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 [3] 18,784,904 18,838,478
Cumulative Unrealized Gain [3] 2,222,099 2,799,411
Estimated Fair Value [3] 21,007,003 21,637,889
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] 9,855,232 9,872,297
Cumulative Unrealized Gain [1] 2,001,464 2,236,259
Estimated Fair Value [1] 11,856,696 12,108,556
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] 12,843,514 12,884,191
Cumulative Unrealized Gain [1] 1,812,321 2,100,598
Estimated Fair Value [1] 14,655,835 14,984,789
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 [3] 11,021,094 11,056,825
Cumulative Unrealized Gain [3] 1,708,507 1,934,146
Estimated Fair Value [3] 12,729,601 12,990,971
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 9,280,000 [4] 9,280,000 [5]
Cumulative Unrealized Gain 936,317 [4] 316,916 [5]
Estimated Fair Value 10,216,317 [4] 9,596,916 [5]
Mortgage Revenue Bonds Held In Trust [Member] | Pro Nova [Member] | TN [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances [8] 8,663,406 10,022,352 [7]
Cumulative Unrealized Loss [7],[8]   (372,169)
Estimated Fair Value [8] 8,663,406 9,650,183 [7]
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 21,600,000 [4] 21,600,000 [5]
Cumulative Unrealized Gain 2,076,089 [4] 835,005 [5]
Estimated Fair Value 23,676,089 [4] 22,435,005 [5]
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 [8] 13,913,910 13,945,681
Cumulative Unrealized Gain [8] 2,010,421 2,356,231
Estimated Fair Value [8] 15,924,331 16,301,912
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 [3] 9,224,980 9,252,257
Cumulative Unrealized Gain [3] 1,605,894 1,715,456
Estimated Fair Value [3] 10,830,874 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 [3] 7,454,400 7,475,794
Cumulative Unrealized Gain [3] 1,275,316 1,336,580
Estimated Fair Value [3] 8,729,716 8,812,374
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 [2] 12,821,526 12,854,039
Cumulative Unrealized Gain [2] 1,870,208 2,065,468
Estimated Fair Value [2] 14,691,734 14,919,507
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 [8] 5,273,090 5,285,131
Cumulative Unrealized Gain [8] 679,531 806,523
Estimated Fair Value [8] 5,952,621 6,091,654
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 [8] 40,038,454 40,129,878
Cumulative Unrealized Gain [8] 5,315,077 6,450,704
Estimated Fair Value [8] 45,353,531 46,580,582
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 [3] 6,436,585 6,455,058
Cumulative Unrealized Gain [3] 1,101,186 1,125,239
Estimated Fair Value [3] 7,537,771 7,580,297
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 [3] 15,715,747 15,762,217
Cumulative Unrealized Gain [3] 2,470,949 2,648,781
Estimated Fair Value [3] 18,186,696 18,410,998
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 [3] 5,103,450 5,118,097
Cumulative Unrealized Gain [3] 895,447 938,032
Estimated Fair Value [3] 5,998,897 6,056,129
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] 17,775,126 17,807,768
Cumulative Unrealized Gain [1] 3,083,030 3,534,702
Estimated Fair Value [1] 20,858,156 21,342,470
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] 18,932,033 18,975,786
Cumulative Unrealized Gain [1] 3,412,592 3,572,995
Estimated Fair Value [1] 22,344,625 22,548,781
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] 13,262,784 13,293,436
Cumulative Unrealized Gain [1] 2,508,285 2,624,054
Estimated Fair Value [1] 15,771,069 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] 20,545,474 20,592,957
Cumulative Unrealized Gain [1] 3,794,305 3,971,001
Estimated Fair Value [1] 24,339,779 24,563,958
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] 7,387,421 7,405,406
Cumulative Unrealized Gain [1] 1,146,538 1,229,438
Estimated Fair Value [1] 8,533,959 8,634,844
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] 22,410,500 22,455,747
Cumulative Unrealized Gain [1] 3,592,948 4,198,200
Estimated Fair Value [1] 26,003,448 26,653,947
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] 19,323,071 19,356,959
Cumulative Unrealized Gain [1] 4,046,705 4,111,518
Estimated Fair Value [1] 23,369,776 23,468,477
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] 6,763,311 6,779,777
Cumulative Unrealized Gain [1] 1,077,559 1,154,387
Estimated Fair Value [1] 7,840,870 7,934,164
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 [2] 10,666,690 10,695,037
Cumulative Unrealized Gain [2] 1,327,878 1,455,672
Estimated Fair Value [2] 11,994,568 12,150,709
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] 12,213,767 12,239,247
Cumulative Unrealized Gain [1] 1,337,957 1,645,817
Estimated Fair Value [1] 13,551,724 13,885,064
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 [6] 9,925,000 9,925,000
Cumulative Unrealized Gain [6] 157,344 80,343
Estimated Fair Value [6] 10,082,344 10,005,343
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 [6] 11,566,796 11,548,337
Cumulative Unrealized Gain [6] 2,124,260 2,334,262
Estimated Fair Value [6] 13,691,056 13,882,599
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] 9,656,406 9,673,117
Cumulative Unrealized Gain [1] 2,128,059 2,287,904
Estimated Fair Value [1] 11,784,465 11,961,021
Mortgage Revenue Bonds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 24,155,016 27,267,010
Cumulative Unrealized Gain 2,681,423 2,742,740
Estimated Fair Value 26,836,439 30,009,750
Mortgage Revenue Bonds [Member] | Greens Property [Member] | Second Mortgage | NC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 928,962 930,016
Cumulative Unrealized Gain 122,356 142,265
Estimated Fair Value 1,051,318 1,072,281
Mortgage Revenue Bonds [Member] | Ohio Properties [Member] | Second Mortgage | OH [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 3,499,720 3,504,171
Cumulative Unrealized Gain 9,812 10,363
Estimated Fair Value 3,509,532 3,514,534
Mortgage Revenue Bonds [Member] | Rosewood Townhomes [Member] | Second Mortgage | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 470,000 470,000
Cumulative Unrealized Gain 1,935 1,685
Estimated Fair Value 471,935 471,685
Mortgage Revenue Bonds [Member] | South Pointe Apartments [Member] | Second Mortgage | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 1,100,000 1,100,000
Cumulative Unrealized Gain 3,962 2,952
Estimated Fair Value 1,103,962 1,102,952
Mortgage Revenue Bonds [Member] | Avistar at the Crest [Member] | Second Mortgage | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 739,691 740,876
Cumulative Unrealized Gain 90,911 94,819
Estimated Fair Value 830,602 835,695
Mortgage Revenue Bonds [Member] | Avistar at the Oaks [Member] | Second Mortgage | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 541,337 542,170
Cumulative Unrealized Gain 62,305 65,455
Estimated Fair Value 603,642 607,625
Mortgage Revenue Bonds [Member] | Avistar at the Parkway [Member] | Second Mortgage | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 124,225 124,305
Cumulative Unrealized Gain 35,847 38,045
Estimated Fair Value 160,072 162,350
Mortgage Revenue Bonds [Member] | Avistar in 09 [Member] | Second Mortgage | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 446,554 447,241
Cumulative Unrealized Gain 51,396 53,995
Estimated Fair Value 497,950 501,236
Mortgage Revenue Bonds [Member] | Avistar on the Boulevard [Member] | Second Mortgage | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 439,527 440,231
Cumulative Unrealized Gain 49,214 53,056
Estimated Fair Value 488,741 493,287
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 13,200,000
Cumulative Unrealized Gain 1,629,097 1,654,870
Estimated Fair Value 14,829,097 14,854,870
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 624,588  
Estimated Fair Value $ 3,289,588  
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
[1] MRBs owned by ATAX TEBS IV, LLC (M45 TEBS), Note 15
[2] MRBs owned by ATAX TEBS III, LLC (M33 TEBS), Note 15
[3] MRBs owned by ATAX TEBS II, LLC (M31 TEBS), Note 15
[4] MRBs held by Mizuho Capital Markets, LLC in a secured financing transaction, Note 15
[5] MRB held by Mizuho Capital Markets, LLC in a secured financing transaction, see Note 15
[6] MRBs owned by ATAX TEBS I, LLC (M24 TEBS), Note 15
[7] As of the date presented, the MRB had been in a cumulative unrealized loss for less than 12 consecutive months.
[8] MRBs held by Deutsche Bank in a secured financing transaction, Note 15
[9] MRB held by Morgan Stanley in a secured financing transaction, Note 15
[10] MRB held by Morgan Stanley in a secured financing transaction, see Note 15