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Investments in Mortgage Revenue Bonds ("MRBs") - Schedule of investments in MRBs (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Mortgage Revenue Bonds Held In Trust [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns $ 629,778,112 $ 639,438,294
Cumulative Unrealized Gain 51,519,368 71,429,153
Cumulative Unrealized Loss (96,322)  
Estimated Fair Value 681,201,158 710,867,447
Mortgage Revenue Bonds Held In Trust [Member] | Courtyard [Member] | Series A and B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1] 16,458,000 16,458,000
Cumulative Unrealized Gain [1] 773,689 1,226,192
Estimated Fair Value [1] 17,231,689 17,684,192
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 [2] 4,616,146 4,627,228
Cumulative Unrealized Gain [2] 392,021 523,464
Estimated Fair Value [2] 5,008,167 5,150,692
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 [1] 3,730,000 3,730,000
Cumulative Unrealized Gain [1] 267,644 430,637
Estimated Fair Value [1] 3,997,644 4,160,637
Mortgage Revenue Bonds Held In Trust [Member] | Harmony Terrace [Member] | Series A and B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1] 14,300,000 14,300,000
Cumulative Unrealized Gain [1] 560,658 871,221
Estimated Fair Value [1] 14,860,658 15,171,221
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 [3] 6,828,743 6,845,985
Cumulative Unrealized Gain [3] 886,164 1,182,914
Estimated Fair Value [3] 7,714,907 8,028,899
Mortgage Revenue Bonds Held In Trust [Member] | Las Palmas II [Member] | Series A and B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1] 3,465,000 3,465,000
Cumulative Unrealized Gain [1] 119,122 193,418
Estimated Fair Value [1] 3,584,122 3,658,418
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 [2] 2,500,824 2,506,828
Cumulative Unrealized Gain [2] 321,683 398,840
Estimated Fair Value [2] 2,822,507 2,905,668
Mortgage Revenue Bonds Held In Trust [Member] | San Vicente [Member] | Series A and B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1] 5,320,000 5,320,000
Cumulative Unrealized Gain [1] 178,617 309,038
Estimated Fair Value [1] 5,498,617 5,629,038
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 [2] 3,029,654 3,036,928
Cumulative Unrealized Gain [2] 414,470 535,673
Estimated Fair Value [2] 3,444,124 3,572,601
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 [1] 4,356,248 4,366,195
Cumulative Unrealized Gain [1] 648,547 807,864
Estimated Fair Value [1] 5,004,795 5,174,059
Mortgage Revenue Bonds Held In Trust [Member] | Seasons Lakewood [Member] | Series A and B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1]   12,610,000
Cumulative Unrealized Gain [1]   884,537
Estimated Fair Value [1]   13,494,537
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 [1] 7,350,000  
Cumulative Unrealized Gain [1] 566,282  
Estimated Fair Value [1] 7,916,282  
Mortgage Revenue Bonds Held In Trust [Member] | Seasons San Juan Capistrano [Member] | Series A and B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1] 18,949,000 18,949,000
Cumulative Unrealized Gain [1] 699,621 1,233,570
Estimated Fair Value [1] 19,648,621 20,182,570
Mortgage Revenue Bonds Held In Trust [Member] | Summerhill [Member] | Series A and B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1]   9,795,000
Cumulative Unrealized Gain [1]   738,806
Estimated Fair Value [1]   10,533,806
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 [1] 6,423,000  
Cumulative Unrealized Gain [1] 460,878  
Estimated Fair Value [1] 6,883,878  
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 [1] 3,625,940 3,632,000
Cumulative Unrealized Gain [1] 312,495 490,314
Estimated Fair Value [1] 3,938,435 4,122,314
Mortgage Revenue Bonds Held In Trust [Member] | The Village at Madera [Member] | Series A and B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1] 4,804,000 4,804,000
Cumulative Unrealized Gain [1] 219,826 355,303
Estimated Fair Value [1] 5,023,826 5,159,303
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 [3] 5,950,280 5,965,475
Cumulative Unrealized Gain [3] 570,581 807,688
Estimated Fair Value [3] 6,520,861 6,773,163
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 [3] 3,888,497 3,898,427
Cumulative Unrealized Gain [3] 482,661 568,423
Estimated Fair Value [3] 4,371,158 4,466,850
Mortgage Revenue Bonds Held In Trust [Member] | Lake Forest [Member] | FL [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [4] 8,469,000 8,505,000
Cumulative Unrealized Gain [4] 1,181,238 1,579,885
Estimated Fair Value [4] 9,650,238 10,084,885
Mortgage Revenue Bonds Held In Trust [Member] | Brookstone [Member] | IL [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [4] 7,446,582 7,450,595
Cumulative Unrealized Gain [4] 1,452,965 2,017,019
Estimated Fair Value [4] 8,899,547 9,467,614
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 [3] 5,100,000 5,100,000
Cumulative Unrealized Gain [3] 624,322 778,339
Estimated Fair Value [3] 5,724,322 5,878,339
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 [2] 11,211,177 11,239,441
Cumulative Unrealized Gain [2] 1,495,441 2,096,328
Estimated Fair Value [2] 12,706,618 13,335,769
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 [1] 40,380,356 40,573,347
Cumulative Unrealized Gain [1] 3,138,301 3,710,942
Estimated Fair Value [1] 43,518,657 44,284,289
Mortgage Revenue Bonds Held In Trust [Member] | Woodlynn Village [Member] | MN [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [4] 4,267,000 4,267,000
Cumulative Unrealized Gain [4] 10,058 44,428
Estimated Fair Value [4] 4,277,058 4,311,428
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 [3] 8,104,000 8,126,000
Cumulative Unrealized Gain [3] 921,283 1,113,852
Estimated Fair Value [3] 9,025,283 9,239,852
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 [2] 7,865,663 7,879,590
Cumulative Unrealized Gain [2] 683,207 1,140,448
Estimated Fair Value [2] 8,548,870 9,020,038
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 [4] 14,083,000 14,113,000
Cumulative Unrealized Gain [4] 634,474 788,199
Estimated Fair Value [4] 14,717,474 14,901,199
Mortgage Revenue Bonds Held In Trust [Member] | Bridle Ridge [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [4] 7,430,000 7,465,000
Cumulative Unrealized Gain [4] 47,812 1,199
Estimated Fair Value [4] 7,477,812 7,466,199
Mortgage Revenue Bonds Held In Trust [Member] | Columbia Gardens [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1] 13,336,778 13,396,856
Cumulative Unrealized Gain [1] 1,267,129 1,413,831
Estimated Fair Value [1] 14,603,907 14,810,687
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 [1] 11,377,893 11,404,758
Cumulative Unrealized Gain [1] 960,039 1,284,441
Estimated Fair Value [1] 12,337,932 12,689,199
Mortgage Revenue Bonds Held In Trust [Member] | Cross Creek [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [4] 6,139,056 6,136,553
Cumulative Unrealized Gain [4] 2,705,228 2,850,344
Estimated Fair Value [4] 8,844,284 8,986,897
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 [3] 19,191,003 19,238,297
Cumulative Unrealized Gain [3] 1,945,444 2,712,429
Estimated Fair Value [3] 21,136,447 21,950,726
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 [1] 9,984,860 10,000,000
Cumulative Unrealized Gain [1] 1,324,906 1,182,706
Estimated Fair Value [1] 11,309,766 11,182,706
Mortgage Revenue Bonds Held In Trust [Member] | Willow Run [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1] 13,152,289 13,212,587
Cumulative Unrealized Gain [1] 1,195,384 1,391,536
Estimated Fair Value [1] 14,347,673 14,604,123
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 [3] 11,292,992 11,342,234
Cumulative Unrealized Gain [3] 1,186,994 1,693,626
Estimated Fair Value [3] 12,479,986 13,035,860
Mortgage Revenue Bonds Held In Trust [Member] | Pro Nova 2014-1 [Member] | TN [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1] 10,031,209 10,038,889
Cumulative Unrealized Gain [1]   133,878
Cumulative Unrealized Loss [1] (67,060)  
Estimated Fair Value [1] 9,964,149 10,172,767
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 [1] 10,000,000 10,000,000
Cumulative Unrealized Gain [1] 198,101 628,644
Estimated Fair Value [1] 10,198,101 10,628,644
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 [3] 9,432,184 9,456,384
Cumulative Unrealized Gain [3] 785,646 1,187,142
Estimated Fair Value [3] 10,217,830 10,643,526
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 [3] 7,616,915 7,635,895
Cumulative Unrealized Gain [3] 629,510 938,465
Estimated Fair Value [3] 8,246,425 8,574,360
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 [2] 13,204,519 13,233,665
Cumulative Unrealized Gain [2] 481,891 932,753
Estimated Fair Value [2] 13,686,410 14,166,418
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 [1] 3,775,000 3,775,000
Cumulative Unrealized Gain [1]   125,170
Cumulative Unrealized Loss [1] (29,262)  
Estimated Fair Value [1] 3,745,738 3,900,170
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 [1] 31,850,000 31,850,000
Cumulative Unrealized Gain [1] 503,531 1,865,826
Estimated Fair Value [1] 32,353,531 33,715,826
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 [3] 6,576,911 6,593,300
Cumulative Unrealized Gain [3] 514,160 716,944
Estimated Fair Value [3] 7,091,071 7,310,244
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 [3] 16,068,745 16,109,972
Cumulative Unrealized Gain [3] 1,268,206 1,947,465
Estimated Fair Value [3] 17,336,951 18,057,437
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 [3] 5,262,510 5,275,623
Cumulative Unrealized Gain [3] 434,927 648,383
Estimated Fair Value [3] 5,697,437 5,924,006
Mortgage Revenue Bonds Held In Trust [Member] | Bella Vista [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [4] 6,295,000 6,295,000
Cumulative Unrealized Gain [4] 72,246 42,718
Estimated Fair Value [4] 6,367,246 6,337,718
Mortgage Revenue Bonds Held In Trust [Member] | Bruton Apartments [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1] 18,022,873 18,051,775
Cumulative Unrealized Gain [1] 1,975,389 3,042,939
Estimated Fair Value [1] 19,998,262 21,094,714
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 [1] 19,185,000 19,185,000
Cumulative Unrealized Gain [1] 2,094,593 2,759,654
Estimated Fair Value [1] 21,279,593 21,944,654
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 [1] 13,440,000 13,440,000
Cumulative Unrealized Gain [1] 1,530,165 1,999,572
Estimated Fair Value [1] 14,970,165 15,439,572
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 [1] 20,820,000 20,820,000
Cumulative Unrealized Gain [1] 2,370,389 2,994,839
Estimated Fair Value [1] 23,190,389 23,814,839
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 [1] 7,524,044 7,540,000
Cumulative Unrealized Gain [1] 525,631 634,091
Estimated Fair Value [1] 8,049,675 8,174,091
Mortgage Revenue Bonds Held In Trust [Member] | Decatur-Angle [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1] 22,754,649 22,794,912
Cumulative Unrealized Gain [1] 1,465,876 2,985,955
Estimated Fair Value [1] 24,220,525 25,780,867
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 [1] 6,888,392 6,903,000
Cumulative Unrealized Gain [1] 600,565 580,522
Estimated Fair Value [1] 7,488,957 7,483,522
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 [2] 11,037,518 11,063,027
Cumulative Unrealized Gain [2] 676,672 993,609
Estimated Fair Value [2] 11,714,190 12,056,636
Mortgage Revenue Bonds Held In Trust [Member] | Oaks at Georgetown [Member] | Series A and B [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [1] 17,842,000 17,842,000
Cumulative Unrealized Gain [1] 406,337 915,705
Estimated Fair Value [1] 18,248,337 18,757,705
Mortgage Revenue Bonds Held In Trust [Member] | Runnymede [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [4] 10,150,000 10,150,000
Cumulative Unrealized Gain [4] 140,110 79,514
Estimated Fair Value [4] 10,290,110 10,229,514
Mortgage Revenue Bonds Held In Trust [Member] | Southpark [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [4] 11,712,016 11,693,138
Cumulative Unrealized Gain [4] 2,679,516 2,960,294
Estimated Fair Value [4] 14,391,532 14,653,432
Mortgage Revenue Bonds Held In Trust [Member] | Vantage at Judson [Member] | Series B [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [2] 26,078,566 26,133,557
Cumulative Unrealized Gain [2] 2,111,015 3,117,969
Estimated Fair Value [2] 28,189,581 29,251,526
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 [1] 9,783,080 9,797,833
Cumulative Unrealized Gain [1] 1,405,708 1,839,648
Estimated Fair Value [1] 11,188,788 11,637,481
Mortgage Revenue Bonds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 74,452,133 76,274,522
Cumulative Unrealized Gain 1,716,281 1,697,303
Cumulative Unrealized Loss (1,410,118) (617)
Estimated Fair Value 74,758,296 77,971,208
Mortgage Revenue Bonds [Member] | Montecito at Williams Ranch Apartments [Member] | Series A and B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 12,471,000 12,471,000
Cumulative Unrealized Gain 776,383 1,111,807
Estimated Fair Value 13,247,383 13,582,807
Mortgage Revenue Bonds [Member] | Seasons at Simi Valley [Member] | Series B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 1,944,000 1,944,000
Cumulative Unrealized Loss (1,136) (466)
Estimated Fair Value 1,942,864 1,943,534
Mortgage Revenue Bonds [Member] | Vineyard Gardens | Series A and B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 6,841,000 6,841,000
Cumulative Unrealized Gain 482,272  
Estimated Fair Value 7,323,272 6,841,000
Mortgage Revenue Bonds [Member] | Sycamore Walk [Member] | Series B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns   1,815,000
Cumulative Unrealized Loss   (151)
Estimated Fair Value   1,814,849
Mortgage Revenue Bonds [Member] | Greens Property [Member] | Series B [Member] | NC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 936,570 937,399
Cumulative Unrealized Gain 169,744 193,991
Estimated Fair Value 1,106,314 1,131,390
Mortgage Revenue Bonds [Member] | Ohio Properties [Member] | Series B [Member] | OH [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 3,532,410 3,536,060
Cumulative Unrealized Gain 130,529 149,630
Estimated Fair Value 3,662,939 3,685,690
Mortgage Revenue Bonds [Member] | Rosewood Townhomes [Member] | Series A and B [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 9,750,000 9,750,000
Cumulative Unrealized Loss (451,738)  
Estimated Fair Value 9,298,262 9,750,000
Mortgage Revenue Bonds [Member] | South Pointe Apartments [Member] | Series A and B [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 22,700,000 22,700,000
Cumulative Unrealized Loss (957,244)  
Estimated Fair Value 21,742,756 22,700,000
Mortgage Revenue Bonds [Member] | Avistar at Copperfield [Member] | Series B [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 4,000,000 4,000,000
Cumulative Unrealized Gain 12,133 13,514
Estimated Fair Value 4,012,133 4,013,514
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 748,465 749,455
Cumulative Unrealized Gain 32,457 58,871
Estimated Fair Value 780,922 808,326
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 547,506 548,202
Cumulative Unrealized Gain 22,972 41,286
Estimated Fair Value 570,478 589,488
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 124,799 124,861
Cumulative Unrealized Gain 26,156 30,715
Estimated Fair Value 150,955 155,576
Mortgage Revenue Bonds [Member] | Avistar at Wilcrest [Member] | Series B [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 1,550,000 1,550,000
Cumulative Unrealized Gain 4,770 5,306
Estimated Fair Value 1,554,770 1,555,306
Mortgage Revenue Bonds [Member] | Avistar at Wood Hollow [Member] | Series B [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 8,410,000 8,410,000
Cumulative Unrealized Gain 27,371 30,276
Estimated Fair Value 8,437,371 8,440,276
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 451,643 452,217
Cumulative Unrealized Gain 13,858 28,675
Estimated Fair Value 465,501 480,892
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 444,740 445,328
Cumulative Unrealized Gain 17,636 33,232
Estimated Fair Value $ 462,376 $ 478,560
[1] MRBs held by Deutsche Bank in a secured financing transaction, Note 14
[2] MRBs owned by ATAX TEBS III, LLC (M33 TEBS), Note 14
[3] MRBs owned by ATAX TEBS II, LLC (M31 TEBS), Note 14
[4] MRBs owned by ATAX TEBS I, LLC (M24 TEBS), Note 14