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Investments in Bonds (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]    
Estimated Fair Value, held in trust $ 26,947,851 $ 90,016,872
Mortgage Revenue Bonds Held In Trust [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 675,550,854 554,678,736
Cumulative Unrealized Gain, held in trust 65,842,333 37,814,237
Cumulative Unrealized Loss, held in trust (211,380) (2,298,794)
Estimated Fair Value, held in trust 741,181,807 590,194,179
Mortgage Revenue Bonds Held In Trust [Member] | Arbors at Hickory Ridge [Member] | TN [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 11,402,860 11,461,719
Cumulative Unrealized Gain, held in trust [1] 1,369,582 891,274
Estimated Fair Value, held in trust [1] 12,772,442 12,352,993
Mortgage Revenue Bonds Held In Trust [Member] | Pro Nova [Member] | TN [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 10,040,407 10,041,924
Cumulative Unrealized Gain, held in trust [2] 238,433 685,576
Estimated Fair Value, held in trust [2] 10,278,840 10,727,500
Mortgage Revenue Bonds Held In Trust [Member] | Lake Forest [Member] | FL [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [3] 8,573,000 8,639,000
Cumulative Unrealized Gain, held in trust [3] 1,526,928 899,694
Estimated Fair Value, held in trust [3] 10,099,928 9,538,694
Mortgage Revenue Bonds Held In Trust [Member] | Ashley Square [Member] | IA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [3] 5,009,000 5,039,000
Cumulative Unrealized Gain, held in trust [3] 27,602 338,556
Estimated Fair Value, held in trust [3] 5,036,602 5,377,556
Mortgage Revenue Bonds Held In Trust [Member] | Brookstone [Member] | IL [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [3] 7,457,419 7,462,678
Cumulative Unrealized Gain, held in trust [3] 1,876,708 1,457,340
Estimated Fair Value, held in trust [3] 9,334,127 8,920,018
Mortgage Revenue Bonds Held In Trust [Member] | Copper Gate [Member] | IN [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 5,145,000 5,145,000
Cumulative Unrealized Gain, held in trust [1] 852,946 528,855
Estimated Fair Value, held in trust [1] 5,997,946 5,673,855
Mortgage Revenue Bonds Held In Trust [Member] | Bella Vista [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [3] 6,295,000 6,365,000
Cumulative Unrealized Gain, held in trust [3] 31,115 500,162
Estimated Fair Value, held in trust [3] 6,326,115 6,865,162
Mortgage Revenue Bonds Held In Trust [Member] | Live 929 Apartments [Member] | MD [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 40,620,378 40,687,425
Cumulative Unrealized Gain, held in trust [2] 4,399,339 3,587,993
Estimated Fair Value, held in trust [2] 45,019,717 44,275,418
Mortgage Revenue Bonds Held In Trust [Member] | Woodlynn Village [Member] | MN [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [3] 4,289,000 4,310,000
Cumulative Unrealized Gain, held in trust [3] 45,956 294,976
Estimated Fair Value, held in trust [3] 4,334,956 4,604,976
Mortgage Revenue Bonds Held In Trust [Member] | Bruton Apts [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 18,108,276 18,145,000
Cumulative Unrealized Gain, held in trust [2] 2,762,491 349,886
Estimated Fair Value, held in trust [2] 20,870,767 18,494,886
Mortgage Revenue Bonds Held In Trust [Member] | Bridle Ridge [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [3] 7,500,000 7,535,000
Cumulative Unrealized Gain, held in trust [3] 117,210 517,881
Estimated Fair Value, held in trust [3] 7,617,210 8,052,881
Mortgage Revenue Bonds Held In Trust [Member] | Columbia Gardens [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 15,209,036 15,214,223
Cumulative Unrealized Loss, held in trust [2] (169,635) (927,030)
Estimated Fair Value, held in trust [2] 15,039,401 14,287,193
Mortgage Revenue Bonds Held In Trust [Member] | Cross Creek [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [3] 6,130,266 6,122,312
Cumulative Unrealized Gain, held in trust [3] 3,081,959 2,655,730
Estimated Fair Value, held in trust [3] 9,212,225 8,778,042
Mortgage Revenue Bonds Held In Trust [Member] | The Palms at Premier Park [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 19,330,703 19,826,716
Cumulative Unrealized Gain, held in trust [1] 2,646,046 1,784,386
Estimated Fair Value, held in trust [1] 21,976,749 21,611,102
Mortgage Revenue Bonds Held In Trust [Member] | Decatur-Angle [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 22,873,696 22,950,214
Cumulative Unrealized Gain, held in trust [2] 2,814,627  
Cumulative Unrealized Loss, held in trust [2]   (290,985)
Estimated Fair Value, held in trust [2] 25,688,323 22,659,229
Mortgage Revenue Bonds Held In Trust [Member] | Companion At Thornhill Apts [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 11,457,334 11,500,000
Cumulative Unrealized Gain, held in trust [2] 1,136,350 645,552
Estimated Fair Value, held in trust [2] 12,593,684 12,145,552
Mortgage Revenue Bonds Held In Trust [Member] | Willow Run [Member] | SC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 15,208,831 15,214,085
Cumulative Unrealized Gain, held in trust [2] 121,616  
Cumulative Unrealized Loss, held in trust [2]   (917,852)
Estimated Fair Value, held in trust [2] 15,330,447 14,296,233
Mortgage Revenue Bonds Held In Trust [Member] | Runnymede [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [3] 10,200,000 10,250,000
Cumulative Unrealized Gain, held in trust [3] 246,902 774,285
Estimated Fair Value, held in trust [3] 10,446,902 11,024,285
Mortgage Revenue Bonds Held In Trust [Member] | Southpark [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [3] 11,790,000 11,751,861
Cumulative Unrealized Gain, held in trust [3] 3,398,493 3,286,203
Estimated Fair Value, held in trust [3] 15,188,493 15,038,064
Mortgage Revenue Bonds Held In Trust [Member] | 15 West Apartments [Member] | WA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 9,826,657 9,850,000
Cumulative Unrealized Gain, held in trust [2] 1,582,220 1,584,281
Estimated Fair Value, held in trust [2] 11,408,877 11,434,281
Mortgage Revenue Bonds Held In Trust [Member] | Series A and B [Member] | Courtyard [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 16,458,000  
Cumulative Unrealized Gain, held in trust [2] 978,912  
Estimated Fair Value, held in trust [2] 17,436,912  
Mortgage Revenue Bonds Held In Trust [Member] | Series A and B [Member] | Harmony Court Bakersfield [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 5,727,000  
Cumulative Unrealized Gain, held in trust [2] 318,500  
Estimated Fair Value, held in trust [2] 6,045,500  
Mortgage Revenue Bonds Held In Trust [Member] | Series A and B [Member] | Harmony Terrace [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 14,300,000 14,300,000
Cumulative Unrealized Gain, held in trust [2] 707,166  
Estimated Fair Value, held in trust [2] 15,007,166 14,300,000
Mortgage Revenue Bonds Held In Trust [Member] | Series A and B [Member] | Las Palmas II [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 3,465,000  
Cumulative Unrealized Gain, held in trust [2] 152,592  
Estimated Fair Value, held in trust [2] 3,617,592  
Mortgage Revenue Bonds Held In Trust [Member] | Series A and B [Member] | San Vicente [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 5,320,000  
Cumulative Unrealized Gain, held in trust [2] 224,555  
Estimated Fair Value, held in trust [2] 5,544,555  
Mortgage Revenue Bonds Held In Trust [Member] | Series A and B [Member] | Seasons Lakewood [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 12,610,000  
Cumulative Unrealized Gain, held in trust [2] 705,110  
Estimated Fair Value, held in trust [2] 13,315,110  
Mortgage Revenue Bonds Held In Trust [Member] | Series A and B [Member] | Seasons San Juan Capistrano [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 18,949,000  
Cumulative Unrealized Gain, held in trust [2] 930,884  
Estimated Fair Value, held in trust [2] 19,879,884  
Mortgage Revenue Bonds Held In Trust [Member] | Series A and B [Member] | Summerhill [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 9,795,000  
Cumulative Unrealized Gain, held in trust [2] 586,729  
Estimated Fair Value, held in trust [2] 10,381,729  
Mortgage Revenue Bonds Held In Trust [Member] | Series A and B [Member] | The Village at Madera [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 4,804,000  
Cumulative Unrealized Gain, held in trust [2] 247,275  
Estimated Fair Value, held in trust [2] 5,051,275  
Mortgage Revenue Bonds Held In Trust [Member] | Series A and B [Member] | Oaks at Georgetown [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 17,842,000 17,842,000
Cumulative Unrealized Gain, held in trust [2] 617,249  
Estimated Fair Value, held in trust [2] 18,459,249 17,842,000
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Glenview Apartments [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [4] 4,648,920 4,670,000
Cumulative Unrealized Gain, held in trust [4] 645,678 132,402
Estimated Fair Value, held in trust [4] 5,294,598 4,802,402
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Harden Ranch [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 6,879,738 6,912,535
Cumulative Unrealized Gain, held in trust [1] 1,105,983 369,738
Estimated Fair Value, held in trust [1] 7,985,721 7,282,273
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Montclair Apts [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [4] 2,518,580 2,530,000
Cumulative Unrealized Gain, held in trust [4] 405,143 108,608
Estimated Fair Value, held in trust [4] 2,923,723 2,638,608
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at Chase Hill - [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 9,797,642 9,844,994
Cumulative Unrealized Gain, held in trust [1] 414,305 589,023
Estimated Fair Value, held in trust [1] 10,211,947 10,434,017
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Santa Fe Apts [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [4] 3,051,165 3,065,000
Cumulative Unrealized Gain, held in trust [4] 531,797 177,093
Estimated Fair Value, held in trust [4] 3,582,962 3,242,093
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at the Crest [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 9,503,712 9,549,644
Cumulative Unrealized Gain, held in trust [1] 1,002,121 753,267
Estimated Fair Value, held in trust [1] 10,505,833 10,302,911
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Seasons at Simi Valley [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 4,376,000 4,376,000
Cumulative Unrealized Gain, held in trust [2] 783,712 308,335
Estimated Fair Value, held in trust [2] 5,159,712 4,684,335
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Sycamore Walk [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 3,632,000 3,632,000
Cumulative Unrealized Gain, held in trust [2] 417,047 130,431
Estimated Fair Value, held in trust [2] 4,049,047 3,762,431
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at the Oaks [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 7,673,015 7,709,040
Cumulative Unrealized Gain, held in trust [1] 864,665 563,138
Estimated Fair Value, held in trust [1] 8,537,680 8,272,178
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Westside Village Market [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 3,917,864 3,936,750
Cumulative Unrealized Gain, held in trust [1] 610,615 102,641
Estimated Fair Value, held in trust [1] 4,528,479 4,039,391
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at the Parkway [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [4] 13,290,665 13,300,000
Cumulative Unrealized Gain, held in trust [4] 915,151  
Cumulative Unrealized Loss, held in trust [4]   (78,749)
Estimated Fair Value, held in trust [4] 14,205,816 13,221,251
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Tyler Park Apartments [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 5,995,219 6,024,120
Cumulative Unrealized Gain, held in trust [1] 766,254 237,582
Estimated Fair Value, held in trust [1] 6,761,473 6,261,702
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar in 09 [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 6,625,352 6,656,458
Cumulative Unrealized Gain, held in trust [1] 588,902 359,562
Estimated Fair Value, held in trust [1] 7,214,254 7,016,020
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar on the Boulevard [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 16,190,599 16,268,850
Cumulative Unrealized Gain, held in trust [1] 1,631,593 1,283,272
Estimated Fair Value, held in trust [1] 17,822,192 17,552,122
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar on the Hills [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 5,301,268 5,326,157
Cumulative Unrealized Gain, held in trust [1] 597,394 423,496
Estimated Fair Value, held in trust [1] 5,898,662 5,749,653
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Rennaisance [Member] | LA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [4] 11,294,718 11,348,364
Cumulative Unrealized Gain, held in trust [4] 1,657,054 826,369
Estimated Fair Value, held in trust [4] 12,951,772 12,174,733
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Greens of Pine Glen [Member] | NC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [1] 8,168,000 8,210,000
Cumulative Unrealized Gain, held in trust [1] 1,284,012 844,585
Estimated Fair Value, held in trust [1] 9,452,012 9,054,585
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Silver Moon [Member] | NM [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [4] 7,906,826 7,933,259
Cumulative Unrealized Gain, held in trust [4] 868,554 465,382
Estimated Fair Value, held in trust [4] 8,775,380 8,398,641
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Concord at Gulfgate [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 19,185,000 19,185,000
Cumulative Unrealized Gain, held in trust [2] 2,575,473 1,200,246
Estimated Fair Value, held in trust [2] 21,760,473 20,385,246
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Ohio Properties [Member] | OH [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [3] 14,166,998 14,215,000
Cumulative Unrealized Gain, held in trust [3] 1,088,481 2,327,468
Estimated Fair Value, held in trust [3] 15,255,479 16,542,468
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Concord at Little York [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 13,440,000 13,440,000
Cumulative Unrealized Gain, held in trust [2] 1,871,771 1,044,752
Estimated Fair Value, held in trust [2] 15,311,771 14,484,752
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Concord at Williamcrest [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 20,820,000 20,820,000
Cumulative Unrealized Gain, held in trust [2] 2,794,962 1,302,534
Estimated Fair Value, held in trust [2] 23,614,962 22,122,534
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Heritage Square [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [4] 11,112,914 11,161,330
Cumulative Unrealized Gain, held in trust [4] 1,225,235 905,455
Estimated Fair Value, held in trust [4] 12,338,149 12,066,785
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at Copperfield [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 10,000,000  
Cumulative Unrealized Gain, held in trust [2] 491,288  
Estimated Fair Value, held in trust [2] 10,491,288  
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Crossing at 1415 [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 7,590,000 7,590,000
Cumulative Unrealized Loss, held in trust [2] (41,745) (45,555)
Estimated Fair Value, held in trust [2] 7,548,255 7,544,445
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at Wilcrest [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 3,775,000  
Cumulative Unrealized Gain, held in trust [2] 201,007  
Estimated Fair Value, held in trust [2] 3,976,007  
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Heights at 515 [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 6,435,000 6,435,000
Cumulative Unrealized Gain, held in trust [2] 222,833  
Cumulative Unrealized Loss, held in trust [2]   (38,623)
Estimated Fair Value, held in trust [2] 6,657,833 6,396,377
Mortgage Revenue Bonds Held In Trust [Member] | Series A [Member] | Avistar at Wood Hollow [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [2] 31,850,000  
Cumulative Unrealized Gain, held in trust [2] 1,564,751  
Estimated Fair Value, held in trust [2] 33,414,751  
Mortgage Revenue Bonds Held In Trust [Member] | Series B [Member] | Vantage at Harlingen [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [4] 24,426,694 24,529,580
Cumulative Unrealized Gain, held in trust [4] 1,972,705 917,720
Estimated Fair Value, held in trust [4] 26,399,399 25,447,300
Mortgage Revenue Bonds Held In Trust [Member] | Series B [Member] | Vantage at Judson [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust [4] 26,241,102 26,356,498
Cumulative Unrealized Gain, held in trust [4] 2,998,352 1,658,508
Estimated Fair Value, held in trust [4] 29,239,454 28,015,006
Mortgage Revenue Bonds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 26,327,057 89,510,867
Cumulative Unrealized Gain, held in trust 679,177 869,807
Cumulative Unrealized Loss, held in trust (58,383) (363,802)
Estimated Fair Value, held in trust 26,947,851 90,016,872
Mortgage Revenue Bonds [Member] | Series A and B [Member] | Courtyard [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust   16,458,000
Estimated Fair Value, held in trust   16,458,000
Mortgage Revenue Bonds [Member] | Series A and B [Member] | Harmony Court Bakersfield [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust   5,727,000
Cumulative Unrealized Gain, held in trust   29,252
Estimated Fair Value, held in trust   5,756,252
Mortgage Revenue Bonds [Member] | Series A and B [Member] | Las Palmas II [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust   3,465,000
Cumulative Unrealized Gain, held in trust   15,139
Estimated Fair Value, held in trust   3,480,139
Mortgage Revenue Bonds [Member] | Series A and B [Member] | San Vicente [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust   5,320,000
Cumulative Unrealized Loss, held in trust   (30,019)
Estimated Fair Value, held in trust   5,289,981
Mortgage Revenue Bonds [Member] | Series A and B [Member] | Seasons Lakewood [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust   12,610,000
Estimated Fair Value, held in trust   12,610,000
Mortgage Revenue Bonds [Member] | Series A and B [Member] | Seasons San Juan Capistrano [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust   18,949,000
Estimated Fair Value, held in trust   18,949,000
Mortgage Revenue Bonds [Member] | Series A and B [Member] | Summerhill [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust   9,795,000
Cumulative Unrealized Loss, held in trust   (174,982)
Estimated Fair Value, held in trust   9,620,018
Mortgage Revenue Bonds [Member] | Series A and B [Member] | The Village at Madera [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust   4,804,000
Cumulative Unrealized Loss, held in trust   (84,437)
Estimated Fair Value, held in trust   4,719,563
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at Chase Hill - [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 955,299 957,627
Cumulative Unrealized Gain, held in trust   41,820
Cumulative Unrealized Loss, held in trust (56,475)  
Estimated Fair Value, held in trust 898,824 999,447
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at the Crest [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 751,370 753,201
Cumulative Unrealized Gain, held in trust 45,428 64,228
Estimated Fair Value, held in trust 796,798 817,429
Mortgage Revenue Bonds [Member] | Series B [Member] | Seasons at Simi Valley [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 1,944,000 1,944,000
Cumulative Unrealized Gain, held in trust 175 27,727
Estimated Fair Value, held in trust 1,944,175 1,971,727
Mortgage Revenue Bonds [Member] | Series B [Member] | Sycamore Walk [Member] | CA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 1,815,000 1,815,000
Cumulative Unrealized Loss, held in trust (1,908) (64,432)
Estimated Fair Value, held in trust 1,813,092 1,750,568
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at the Oaks [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 549,549 550,836
Cumulative Unrealized Gain, held in trust 31,642 47,231
Estimated Fair Value, held in trust 581,191 598,067
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at the Parkway [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 124,981 125,000
Cumulative Unrealized Gain, held in trust 31,136  
Cumulative Unrealized Loss, held in trust   (3,341)
Estimated Fair Value, held in trust 156,117 121,659
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar in 09 [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 453,328 454,390
Cumulative Unrealized Gain, held in trust 15,415 38,961
Estimated Fair Value, held in trust 468,743 493,351
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar on the Boulevard [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 446,466 447,554
Cumulative Unrealized Gain, held in trust 25,241 38,165
Estimated Fair Value, held in trust 471,707 485,719
Mortgage Revenue Bonds [Member] | Series B [Member] | Greens of Pine Glen [Member] | NC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 938,985 940,479
Cumulative Unrealized Gain, held in trust 219,878 118,216
Estimated Fair Value, held in trust 1,158,863 1,058,695
Mortgage Revenue Bonds [Member] | Series B [Member] | Ohio Properties [Member] | OH [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 3,543,079 3,549,780
Cumulative Unrealized Gain, held in trust 214,019 449,068
Estimated Fair Value, held in trust 3,757,098 3,998,848
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at Copperfield [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 4,000,000  
Cumulative Unrealized Gain, held in trust 24,939  
Estimated Fair Value, held in trust 4,024,939  
Mortgage Revenue Bonds [Member] | Series B [Member] | Crossing at 1415 [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 335,000 335,000
Cumulative Unrealized Gain, held in trust 2,191  
Cumulative Unrealized Loss, held in trust   (2,614)
Estimated Fair Value, held in trust 337,191 332,386
Mortgage Revenue Bonds [Member] | Series B [Member] | Heights at 515 [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 510,000 510,000
Cumulative Unrealized Gain, held in trust 3,686  
Cumulative Unrealized Loss, held in trust   (3,977)
Estimated Fair Value, held in trust 513,686 $ 506,023
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at Wilcrest [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 1,550,000  
Cumulative Unrealized Gain, held in trust 9,782  
Estimated Fair Value, held in trust 1,559,782  
Mortgage Revenue Bonds [Member] | Series B [Member] | Avistar at Wood Hollow [Member] | TX [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis, Held in Trust 8,410,000  
Cumulative Unrealized Gain, held in trust 55,645  
Estimated Fair Value, held in trust $ 8,465,645  
[1] MRBs owned by ATAX TEBS II, LLC (M31 TEBS), Note 15
[2] MRBs held by Deutsche Bank in a secured financing transaction, Note 15
[3] MRBs owned by ATAX TEBS I, LLC (M24 TEBS), Note 15
[4] MRBs owned by ATAX TEBS III, LLC (M33 TEBS), Note 15