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Investments in Mortgage Revenue Bonds - Information Regarding MRBs Owned (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Mortgage Revenue Bonds Held In Trust [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns $ 648,445,150 $ 586,445,474
Cumulative Unrealized Gain 95,795,445 58,813,399
Cumulative Unrealized Loss (652,880)  
Estimated Fair Value 743,587,715 645,258,873
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 [1] 10,147,686 10,230,000
Cumulative Unrealized Gain [1] 1,602,534 954,573
Estimated Fair Value [1] 11,750,220 11,184,573
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 [2] 11,056,825 11,194,690
Cumulative Unrealized Gain [2] 1,934,146 1,399,461
Estimated Fair Value [2] 12,990,971 12,594,151
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] 3,699,987 3,730,000
Cumulative Unrealized Gain [1] 549,211 312,844
Estimated Fair Value [1] 4,249,198 4,042,844
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 [1] 6,849,214 6,900,000
Cumulative Unrealized Gain [1] 1,121,262 647,686
Estimated Fair Value [1] 7,970,476 7,547,686
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 [2] 9,252,257 9,357,374
Cumulative Unrealized Gain [2] 1,715,456 1,036,288
Estimated Fair Value [2] 10,967,713 10,393,662
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 [2] 7,475,794 7,558,240
Cumulative Unrealized Gain [2] 1,336,580 706,970
Estimated Fair Value [2] 8,812,374 8,265,210
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 [1] 1,679,022 1,692,774
Cumulative Unrealized Gain [1] 263,441 141,187
Estimated Fair Value [1] 1,942,463 1,833,961
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] 4,282,477 4,325,536
Cumulative Unrealized Gain [1] 860,856 655,326
Estimated Fair Value [1] 5,143,333 4,980,862
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 [3] 12,854,039 13,114,418
Cumulative Unrealized Gain [3] 2,065,468 1,232,292
Estimated Fair Value [3] 14,919,507 14,346,710
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] 3,559,011 3,598,006
Cumulative Unrealized Gain [1] 567,713 363,405
Estimated Fair Value [1] 4,126,724 3,961,411
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 [2] 6,455,058 6,526,247
Cumulative Unrealized Gain [2] 1,125,239 525,939
Estimated Fair Value [2] 7,580,297 7,052,186
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 7,681,146 [4] 7,690,000 [5]
Cumulative Unrealized Gain 1,580,303 [4] 973,133 [5]
Estimated Fair Value 9,261,449 [4] 8,663,133 [5]
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 [2] 15,762,217 15,941,296
Cumulative Unrealized Gain [2] 2,648,781 1,628,269
Estimated Fair Value [2] 18,410,998 17,569,565
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 [1] 3,462,053 3,490,410
Cumulative Unrealized Gain [1] 510,593 291,121
Estimated Fair Value [1] 3,972,646 3,781,531
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 [2] 5,118,097 5,221,971
Cumulative Unrealized Gain [2] 938,032 557,084
Estimated Fair Value [2] 6,056,129 5,779,055
Mortgage Revenue Bonds Held In Trust [Member] | Bridle Ridge [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [6] 7,315,000 7,395,000
Cumulative Unrealized Gain [6] 113,469 90,349
Estimated Fair Value [6] 7,428,469 7,485,349
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] 7,295,901 7,350,000
Cumulative Unrealized Gain [1] 1,124,372 654,929
Estimated Fair Value [1] 8,420,273 8,004,929
Mortgage Revenue Bonds Held In Trust [Member] | Brookstone [Member] | IL [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [6] 7,406,755 7,432,076
Cumulative Unrealized Gain [6] 2,194,994 1,956,010
Estimated Fair Value [6] 9,601,749 9,388,086
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 [1] 12,283,916 12,375,000
Cumulative Unrealized Gain [1] 1,893,075 1,102,687
Estimated Fair Value [1] 14,176,991 13,477,687
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] 17,807,768 17,933,482
Cumulative Unrealized Gain [1] 3,534,702 2,046,056
Estimated Fair Value [1] 21,342,470 19,979,538
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] 6,371,318 6,423,000
Cumulative Unrealized Gain [1] 797,228 508,639
Estimated Fair Value [1] 7,168,546 6,931,639
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] 13,064,589 13,222,480
Cumulative Unrealized Gain [1] 2,179,744 1,396,828
Estimated Fair Value [1] 15,244,333 14,619,308
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] 18,975,786 19,144,400
Cumulative Unrealized Gain [1] 3,572,995 2,222,555
Estimated Fair Value [1] 22,548,781 21,366,955
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 [1] 3,060,177 3,085,000
Cumulative Unrealized Gain [1] 454,240 229,934
Estimated Fair Value [1] 3,514,417 3,314,934
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] 13,293,436 13,411,558
Cumulative Unrealized Gain [1] 2,624,054 1,617,217
Estimated Fair Value [1] 15,917,490 15,028,775
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] 20,592,957 20,775,940
Cumulative Unrealized Gain [1] 3,971,001 2,505,243
Estimated Fair Value [1] 24,563,958 23,281,183
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 3,995,000 [4] 3,995,000 [5]
Cumulative Unrealized Gain 815,213 [4] 534,351 [5]
Estimated Fair Value 4,810,213 [4] 4,529,351 [5]
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 [2] 5,005,000 5,055,000
Cumulative Unrealized Gain [2] 682,497 643,012
Estimated Fair Value [2] 5,687,497 5,698,012
Mortgage Revenue Bonds Held In Trust [Member] | Cross Creek [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [6] 6,143,976 6,143,919
Cumulative Unrealized Gain [6] 2,507,072 2,540,949
Estimated Fair Value [6] 8,651,048 8,684,868
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] 22,455,747 22,630,276
Cumulative Unrealized Gain [1] 4,198,200 1,945,516
Estimated Fair Value [1] 26,653,947 24,575,792
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 [3] 4,533,958 4,581,930
Cumulative Unrealized Gain [3] 757,900 524,024
Estimated Fair Value [3] 5,291,858 5,105,954
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 [2] 7,936,000 8,032,000
Cumulative Unrealized Gain [2] 845,678 818,686
Estimated Fair Value [2] 8,781,678 8,850,686
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] 11,178,557 11,294,928
Cumulative Unrealized Gain [1] 1,709,040 1,148,219
Estimated Fair Value [1] 12,887,597 12,443,147
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 [2] 6,700,868 6,775,508
Cumulative Unrealized Gain [2] 1,281,980 1,007,557
Estimated Fair Value [2] 7,982,848 7,783,065
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 [3] 10,695,037 10,958,661
Cumulative Unrealized Gain [3] 1,455,672 893,881
Estimated Fair Value [3] 12,150,709 11,852,542
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 39,984,026 [4],[7] 40,240,405 [5]
Cumulative Unrealized Gain [5]   2,873,978
Cumulative Unrealized Loss [4],[7] (280,711)  
Estimated Fair Value 39,703,315 [4],[7] 43,114,383 [5]
Mortgage Revenue Bonds Held In Trust [Member] | Gateway Village [Member] | NC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [5] 2,600,000  
Cumulative Unrealized Gain [5] 509,901  
Estimated Fair Value [5] 3,109,901  
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 [3] 2,456,298 2,482,288
Cumulative Unrealized Gain [3] 446,558 246,752
Estimated Fair Value [3] 2,902,856 2,729,040
Mortgage Revenue Bonds Held In Trust [Member] | Lynnhaven Apartments [Member] | NC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [5] 3,450,000  
Cumulative Unrealized Gain [5] 393,686  
Estimated Fair Value [5] 3,843,686  
Mortgage Revenue Bonds Held In Trust [Member] | Pro Nova [Member] | TN [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [5] 10,022,352 [7] 10,027,413
Cumulative Unrealized Gain [5]   19,710
Cumulative Unrealized Loss [5],[7] (372,169)  
Estimated Fair Value [5] 9,650,183 [7] 10,047,123
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 [6] 13,857,000 13,989,000
Cumulative Unrealized Gain [6] 48,813 241,675
Estimated Fair Value [6] 13,905,813 14,230,675
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 [4] 9,280,000  
Cumulative Unrealized Gain [4] 316,916  
Estimated Fair Value [4] 9,596,916  
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 [3] 11,001,027 11,123,800
Cumulative Unrealized Gain [3] 1,775,086 1,383,680
Estimated Fair Value [3] 12,776,113 12,507,480
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 [8] 16,302,038  
Cumulative Unrealized Gain [8] 3,131,843  
Estimated Fair Value [8] 19,433,881  
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 [4] 21,600,000  
Cumulative Unrealized Gain [4] 835,005  
Estimated Fair Value [4] 22,435,005  
Mortgage Revenue Bonds Held In Trust [Member] | Runnymede [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [6] 9,925,000 10,040,000
Cumulative Unrealized Gain [6] 80,343 64,280
Estimated Fair Value [6] 10,005,343 10,104,280
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 [3] 2,975,713 3,007,198
Cumulative Unrealized Gain [3] 540,988 401,203
Estimated Fair Value [3] 3,516,701 3,408,401
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] 9,872,297 9,938,059
Cumulative Unrealized Gain [1] 2,236,259 1,421,114
Estimated Fair Value [1] 12,108,556 11,359,173
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 [3] 7,762,116 7,822,610
Cumulative Unrealized Gain [3] 1,166,748 778,940
Estimated Fair Value [3] 8,928,864 8,601,550
Mortgage Revenue Bonds Held In Trust [Member] | Southpark [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [6] 11,548,337 11,623,649
Cumulative Unrealized Gain [6] 2,334,262 2,482,923
Estimated Fair Value [6] 13,882,599 14,106,572
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 [2] 18,838,478 19,044,617
Cumulative Unrealized Gain [2] 2,799,411 2,194,791
Estimated Fair Value [2] 21,637,889 21,239,408
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 [2] 5,837,595 5,903,368
Cumulative Unrealized Gain [2] 864,894 731,073
Estimated Fair Value [2] 6,702,489 6,634,441
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 [5] 13,945,681 10,000,000
Cumulative Unrealized Gain [5] 2,356,231 589,196
Estimated Fair Value [5] 16,301,912 10,589,196
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 [2] 3,814,857 3,857,839
Cumulative Unrealized Gain [2] 594,361 483,436
Estimated Fair Value [2] 4,409,218 4,341,275
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] 12,884,191 13,040,029
Cumulative Unrealized Gain [1] 2,100,598 1,375,542
Estimated Fair Value [1] 14,984,789 14,415,571
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 [5] 5,285,131 3,775,000
Cumulative Unrealized Gain [5] 806,523 206,263
Estimated Fair Value [5] 6,091,654 3,981,263
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] 7,405,406 7,474,716
Cumulative Unrealized Gain [1] 1,229,438 600,738
Estimated Fair Value [1] 8,634,844 8,075,454
Mortgage Revenue Bonds Held In Trust [Member] | Woodlynn Village [Member] | MN [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [6] 4,172,000 4,221,000
Cumulative Unrealized Gain [6] 44,510 34,155
Estimated Fair Value [6] 4,216,510 4,255,155
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 [5] 40,129,878 31,850,000
Cumulative Unrealized Gain [5] 6,450,704 1,624,687
Estimated Fair Value [5] 46,580,582 33,474,687
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] 6,779,777 6,843,232
Cumulative Unrealized Gain [1] 1,154,387 722,522
Estimated Fair Value [1] 7,934,164 7,565,754
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] 9,673,117 9,737,418
Cumulative Unrealized Gain [1] 2,287,904 1,480,489
Estimated Fair Value [1] 11,961,021 11,217,907
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 [1] 19,356,959 19,487,713
Cumulative Unrealized Gain [1] 4,111,518 2,350,453
Estimated Fair Value [1] 23,468,477 21,838,166
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 [1] 12,239,247 12,330,000
Cumulative Unrealized Gain [1] 1,645,817 693,579
Estimated Fair Value [1] 13,885,064 13,023,579
Mortgage Revenue Bonds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 27,267,010 87,142,842
Cumulative Unrealized Gain 2,742,740 1,809,746
Cumulative Unrealized Loss   (2,058,026)
Estimated Fair Value 30,009,750 86,894,562
Mortgage Revenue Bonds [Member] | Courtyard [Member] | Series B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns   6,228,000
Cumulative Unrealized Gain   2,450
Estimated Fair Value   6,230,450
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 740,876 745,358
Cumulative Unrealized Gain 94,819 50,965
Estimated Fair Value 835,695 796,323
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 542,170 545,321
Cumulative Unrealized Gain 65,455 28,738
Estimated Fair Value 607,625 574,059
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 124,305 124,600
Cumulative Unrealized Gain 38,045 32,220
Estimated Fair Value 162,350 156,820
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 447,241 449,841
Cumulative Unrealized Gain 53,995 18,742
Estimated Fair Value 501,236 468,583
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 440,231 442,894
Cumulative Unrealized Gain 53,056 27,023
Estimated Fair Value 493,287 469,917
Mortgage Revenue Bonds [Member] | Seasons San Juan Capistrano [Member] | Series B [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns [9]   5,574,000
Cumulative Unrealized Loss [9]   (1,078)
Estimated Fair Value [9]   5,572,922
Mortgage Revenue Bonds [Member] | Greens Property [Member] | Series B [Member] | NC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 930,016 933,928
Cumulative Unrealized Gain 142,265 149,789
Estimated Fair Value 1,072,281 1,083,717
Mortgage Revenue Bonds [Member] | Ohio Properties [Member] | Series B [Member] | OH [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 3,504,171 3,520,900
Cumulative Unrealized Gain 10,363 51,334
Estimated Fair Value 3,514,534 3,572,234
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]   9,750,000
Cumulative Unrealized Loss [9]   (644,962)
Estimated Fair Value [9]   9,105,038
Mortgage Revenue Bonds [Member] | Rosewood Townhomes [Member] | Series B [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns 470,000  
Cumulative Unrealized Gain 1,685  
Estimated Fair Value 471,685  
Mortgage Revenue Bonds [Member] | Village at Avalon [Member] | Series A [Member] | NM [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost Adjusted for Paydowns   16,400,000
Cumulative Unrealized Gain   1,408,802
Estimated Fair Value   17,808,802
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 [9]   22,700,000
Cumulative Unrealized Loss [9]   (1,411,986)
Estimated Fair Value [9]   21,288,014
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 1,100,000  
Cumulative Unrealized Gain 2,952  
Estimated Fair Value 1,102,952  
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
Cumulative Unrealized Gain   11,730
Estimated Fair Value   4,011,730
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
Cumulative Unrealized Gain   4,013
Estimated Fair Value   1,554,013
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
Cumulative Unrealized Gain   23,940
Estimated Fair Value   8,433,940
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 13,200,000  
Cumulative Unrealized Gain 1,654,870  
Estimated Fair Value 14,854,870  
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 5,768,000 5,768,000
Cumulative Unrealized Gain 625,235  
Estimated Fair Value $ 6,393,235 $ 5,768,000
[1] MRB owned by ATAX TEBS IV, LLC (M45 TEBS), see Note 15
[2] MRB owned by ATAX TEBS II, LLC (M31 TEBS), see Note 15
[3] MRB owned by ATAX TEBS III, LLC (M33 TEBS), see Note 15
[4] MRB held by Mizuho Capital Markets, LLC in a secured financing transaction, see Note 15
[5] MRB held by Deutsche Bank in a secured financing transaction, see Note 15
[6] MRB owned by ATAX TEBS I, LLC (M24 TEBS), see Note 15
[7] As of the date presented, the MRB had been in a cumulative unrealized loss for less than 12 consecutive months.
[8] MRB held by Morgan Stanley in a secured financing transaction, see Note 15
[9] As of the date presented, the MRBs had been in a cumulative unrealized loss for less than 12 consecutive months.