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Investments in Mortgage Revenue Bonds - Schedule of investments in MRBs (Details) - USD ($)
Jun. 30, 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 $ 635,712,681 $ 648,445,150
Cumulative Unrealized Gain 109,427,722 95,795,445
Cumulative Unrealized Loss (477,260) (652,880)
Estimated Fair Value 744,663,143 743,587,715
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] 10,104,963 10,147,686
Cumulative Unrealized Gain [1] 1,828,130 1,602,534
Estimated Fair Value [1] 11,933,093 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] 4,508,920 4,533,958
Cumulative Unrealized Gain [2] 848,201 757,900
Estimated Fair Value [2] 5,357,121 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] 3,684,410 3,699,987
Cumulative Unrealized Gain [1] 632,035 549,211
Estimated Fair Value [1] 4,316,445 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] 6,820,517 6,849,214
Cumulative Unrealized Gain [1] 1,274,532 1,121,262
Estimated Fair Value [1] 8,095,049 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] 6,661,912 6,700,868
Cumulative Unrealized Gain [3] 1,313,138 1,281,980
Estimated Fair Value [3] 7,975,050 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] 1,671,884 1,679,022
Cumulative Unrealized Gain [1] 322,393 263,441
Estimated Fair Value [1] 1,994,277 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] 2,442,734 2,456,298
Cumulative Unrealized Gain [2] 511,677 446,558
Estimated Fair Value [2] 2,954,411 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 7,654,093 [4] 7,681,146 [5]
Cumulative Unrealized Gain 1,873,968 [4] 1,580,303 [5]
Estimated Fair Value 9,528,061 [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] 3,447,335 3,462,053
Cumulative Unrealized Gain [1] 632,272 510,593
Estimated Fair Value [1] 4,079,607 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] 2,959,281 2,975,713
Cumulative Unrealized Gain [2] 609,255 540,988
Estimated Fair Value [2] 3,568,536 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] 4,260,003 4,282,477
Cumulative Unrealized Gain [1] 994,172 860,856
Estimated Fair Value [1] 5,254,175 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] 7,265,333 7,295,901
Cumulative Unrealized Gain [1] 1,357,653 1,124,372
Estimated Fair Value [1] 8,622,986 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] 12,232,449 12,283,916
Cumulative Unrealized Gain [1] 2,169,826 1,893,075
Estimated Fair Value [1] 14,402,275 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] 6,344,494 6,371,318
Cumulative Unrealized Gain [1] 1,088,354 797,228
Estimated Fair Value [1] 7,432,848 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] 3,538,734 3,559,011
Cumulative Unrealized Gain [1] 664,864 567,713
Estimated Fair Value [1] 4,203,598 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] 3,047,293 3,060,177
Cumulative Unrealized Gain [1] 536,986 454,240
Estimated Fair Value [1] 3,584,279 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] 5,803,267 5,837,595
Cumulative Unrealized Gain [3] 835,563 864,894
Estimated Fair Value [3] 6,638,830 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 3,983,421 [4] 3,995,000 [5]
Cumulative Unrealized Gain 900,633 [4] 815,213 [5]
Estimated Fair Value 4,884,054 [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] 3,792,423 3,814,857
Cumulative Unrealized Gain [3] 724,447 594,361
Estimated Fair Value [3] 4,516,870 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] 7,391,425 7,406,755
Cumulative Unrealized Gain [6] 2,226,656 2,194,994
Estimated Fair Value [6] 9,618,081 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] 677,901 682,497
Estimated Fair Value [3] 5,682,901 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] 10,936,829 11,001,027
Cumulative Unrealized Gain [2] 1,863,478 1,775,086
Estimated Fair Value [2] 12,800,307 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 39,830,967 [4],[7] 39,984,026 [5],[8]
Cumulative Unrealized Loss (477,260) [4],[7] (280,711) [5],[8]
Estimated Fair Value 39,353,707 [4],[7] 39,703,315 [5],[8]
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] 4,146,000 4,172,000
Cumulative Unrealized Gain [6] 53,964 44,510
Estimated Fair Value [6] 4,199,964 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 2,600,000 [5] 2,600,000 [9]
Cumulative Unrealized Gain 153,039 [5] 509,901 [9]
Estimated Fair Value 2,753,039 [5] 3,109,901 [9]
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] 7,883,000 7,936,000
Cumulative Unrealized Gain [3] 789,730 845,678
Estimated Fair Value [3] 8,672,730 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 3,450,000 [5] 3,450,000 [9]
Cumulative Unrealized Gain 203,071 [5] 393,686 [9]
Estimated Fair Value 3,653,071 [5] 3,843,686 [9]
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] 7,730,484 7,762,116
Cumulative Unrealized Gain [2] 1,696,898 1,166,748
Estimated Fair Value [2] 9,427,382 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 16,246,373 [10] 16,302,038 [11]
Cumulative Unrealized Gain 3,688,529 [10] 3,131,843 [11]
Estimated Fair Value 19,934,902 [10] 19,433,881 [11]
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] 13,791,000 13,857,000
Cumulative Unrealized Gain [6] 60,063 48,813
Estimated Fair Value [6] 13,851,063 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] 144,792 113,469
Estimated Fair Value [6] 7,419,792 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] 12,983,220 13,064,589
Cumulative Unrealized Gain [1] 2,304,405 2,179,744
Estimated Fair Value [1] 15,287,625 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] 11,117,797 11,178,557
Cumulative Unrealized Gain [1] 1,782,671 1,709,040
Estimated Fair Value [1] 12,900,468 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] 6,141,120 6,143,976
Cumulative Unrealized Gain [6] 2,439,945 2,507,072
Estimated Fair Value [6] 8,581,065 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] 18,730,489 18,838,478
Cumulative Unrealized Gain [3] 2,713,107 2,799,411
Estimated Fair Value [3] 21,443,596 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] 9,837,910 9,872,297
Cumulative Unrealized Gain [1] 2,068,508 2,236,259
Estimated Fair Value [1] 11,906,418 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] 12,802,849 12,884,191
Cumulative Unrealized Gain [1] 2,091,951 2,100,598
Estimated Fair Value [1] 14,894,800 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] 10,984,840 11,056,825
Cumulative Unrealized Gain [3] 1,952,655 1,934,146
Estimated Fair Value [3] 12,937,495 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 1,653,451 [4] 316,916 [5]
Estimated Fair Value 10,933,451 [4] 9,596,916 [5]
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 4,071,774 [4] 835,005 [5]
Estimated Fair Value 25,671,774 [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 13,881,681 [5] 13,945,681 [9]
Cumulative Unrealized Gain 2,506,209 [5] 2,356,231 [9]
Estimated Fair Value 16,387,890 [5] 16,301,912 [9]
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] 9,197,291 9,252,257
Cumulative Unrealized Gain [3] 1,960,964 1,715,456
Estimated Fair Value [3] 11,158,255 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] 7,432,683 7,475,794
Cumulative Unrealized Gain [3] 1,573,517 1,336,580
Estimated Fair Value [3] 9,006,200 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] 12,788,522 12,854,039
Cumulative Unrealized Gain [2] 2,343,298 2,065,468
Estimated Fair Value [2] 15,131,820 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 5,260,876 [5] 5,285,131 [9]
Cumulative Unrealized Gain 845,705 [5] 806,523 [9]
Estimated Fair Value 6,106,581 [5] 6,091,654 [9]
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 39,945,710 [5] 40,129,878 [9]
Cumulative Unrealized Gain 6,893,766 [5] 6,450,704 [9]
Estimated Fair Value 46,839,476 [5] 46,580,582 [9]
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] 6,417,834 6,455,058
Cumulative Unrealized Gain [3] 1,358,671 1,125,239
Estimated Fair Value [3] 7,776,505 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] 15,668,577 15,762,217
Cumulative Unrealized Gain [3] 3,071,059 2,648,781
Estimated Fair Value [3] 18,739,636 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] 5,088,582 5,118,097
Cumulative Unrealized Gain [3] 1,100,068 938,032
Estimated Fair Value [3] 6,188,650 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] 17,741,983 17,807,768
Cumulative Unrealized Gain [1] 3,729,856 3,534,702
Estimated Fair Value [1] 21,471,839 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] 18,887,619 18,975,786
Cumulative Unrealized Gain [1] 4,174,496 3,572,995
Estimated Fair Value [1] 23,062,115 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] 13,231,671 13,293,436
Cumulative Unrealized Gain [1] 3,044,416 2,624,054
Estimated Fair Value [1] 16,276,087 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] 20,497,275 20,592,957
Cumulative Unrealized Gain [1] 4,622,985 3,971,001
Estimated Fair Value [1] 25,120,260 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] 7,369,164 7,405,406
Cumulative Unrealized Gain [1] 1,473,173 1,229,438
Estimated Fair Value [1] 8,842,337 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] 22,364,588 22,455,747
Cumulative Unrealized Gain [1] 4,471,786 4,198,200
Estimated Fair Value [1] 26,836,374 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] 19,288,690 19,356,959
Cumulative Unrealized Gain [1] 4,738,934 4,111,518
Estimated Fair Value [1] 24,027,624 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] 6,746,597 6,779,777
Cumulative Unrealized Gain [1] 1,377,255 1,154,387
Estimated Fair Value [1] 8,123,852 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] 10,637,915 10,695,037
Cumulative Unrealized Gain [2] 1,699,021 1,455,672
Estimated Fair Value [2] 12,336,936 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] 12,187,967 12,239,247
Cumulative Unrealized Gain [1] 1,810,989 1,645,817
Estimated Fair Value [1] 13,998,956 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] 9,865,000 9,925,000
Cumulative Unrealized Gain [6] 100,289 80,343
Estimated Fair Value [6] 9,965,289 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] 11,585,255 11,548,337
Cumulative Unrealized Gain [6] 2,191,903 2,334,262
Estimated Fair Value [6] 13,777,158 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] 9,639,432 9,673,117
Cumulative Unrealized Gain [1] 2,584,675 2,287,904
Estimated Fair Value [1] 12,224,107 11,961,021
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],[9]   10,022,352
Cumulative Unrealized Loss [8],[9]   (372,169)
Estimated Fair Value [8],[9]   9,650,183
Mortgage Revenue Bonds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 39,818,269 27,267,010
Cumulative Unrealized Gain 3,143,559 2,742,740
Estimated Fair Value 42,961,828 30,009,750
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 927,877 930,016
Cumulative Unrealized Gain 129,272 142,265
Estimated Fair Value 1,057,149 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 3,495,160 3,504,171
Cumulative Unrealized Gain 13,533 10,363
Estimated Fair Value 3,508,693 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 470,000 470,000
Cumulative Unrealized Gain 2,606 1,685
Estimated Fair Value 472,606 471,685
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 1,100,000 1,100,000
Cumulative Unrealized Gain 6,099 2,952
Estimated Fair Value 1,106,099 1,102,952
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 738,480 740,876
Cumulative Unrealized Gain 116,511 94,819
Estimated Fair Value 854,991 835,695
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 540,485 542,170
Cumulative Unrealized Gain 81,576 65,455
Estimated Fair Value 622,061 607,625
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 124,144 124,305
Cumulative Unrealized Gain 40,059 38,045
Estimated Fair Value 164,203 162,350
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 445,851 447,241
Cumulative Unrealized Gain 69,002 53,995
Estimated Fair Value 514,853 501,236
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 438,807 440,231
Cumulative Unrealized Gain 64,325 53,056
Estimated Fair Value 503,132 493,287
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 1,885,539 1,654,870
Estimated Fair Value 15,085,539 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 719,622  
Estimated Fair Value 3,384,622  
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] | NEVADA    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 7,475,000  
Cumulative Unrealized Gain 15,415  
Estimated Fair Value 7,490,415  
Mortgage Revenue Bonds [Member] | Pro Nova 2014-1 [Member] | TN [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns and Allowances 8,197,465  
Estimated Fair Value $ 8,197,465  
[1] MRBs owned by ATAX TEBS IV, LLC (M45 TEBS), Note 16
[2] MRBs owned by ATAX TEBS III, LLC (M33 TEBS), Note 16
[3] MRBs owned by ATAX TEBS II, LLC (M31 TEBS), Note 16
[4] MRBs held by Mizuho Capital Markets, LLC in a secured financing transaction, Note 16
[5] MRB held by Mizuho Capital Markets, LLC in a secured financing transaction, see Note 16
[6] MRBs owned by ATAX TEBS I, LLC (M24 TEBS), Note 16
[7] As of the date presented, the MRB has been in a cumulative unrealized loss for 12 consecutive months.
[8] As of the date presented, the MRB had been in a cumulative unrealized loss for less than 12 consecutive months.
[9] MRBs held by Deutsche Bank in a secured financing transaction, Note 16
[10] MRB held by Morgan Stanley in a secured financing transaction, Note 16
[11] MRB held by Morgan Stanley in a secured financing transaction, see Note 16