Mortgage Revenue Bonds - Schedule of investments in MRBs (Details) - USD ($)		Mar. 31, 2021	Dec. 31, 2020
Mortgage Revenue Bonds Held In Trust [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		$ 638,674,164	$ 637,948,068
Cumulative Unrealized Gain		114,502,241	130,520,576
Estimated Fair Value		753,176,405	768,468,644
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]	10,038,847	10,061,161
Cumulative Unrealized Gain	[1]	2,036,900	2,487,317
Estimated Fair Value	[1]	12,075,747	12,548,478
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]	4,469,991	4,483,154
Cumulative Unrealized Gain	[2]	941,975	1,010,425
Estimated Fair Value	[2]	5,411,966	5,493,579
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]	3,660,303	3,668,439
Cumulative Unrealized Gain	[1]	726,094	889,216
Estimated Fair Value	[1]	4,386,397	4,557,655
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]	6,776,107	6,791,096
Cumulative Unrealized Gain	[1]	1,416,111	1,724,350
Estimated Fair Value	[1]	8,192,218	8,515,446
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]	6,601,343	6,621,823
Cumulative Unrealized Gain	[3]	1,397,564	1,606,690
Estimated Fair Value	[3]	7,998,907	8,228,513
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]	1,660,837	1,664,566
Cumulative Unrealized Gain	[1]	326,950	400,431
Estimated Fair Value	[1]	1,987,787	2,064,997
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]	2,421,644	2,428,775
Cumulative Unrealized Gain	[2]	518,332	572,671
Estimated Fair Value	[2]	2,939,976	3,001,446
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	[4]	7,612,095	7,626,287
Cumulative Unrealized Gain	[4]	1,916,887	2,350,276
Estimated Fair Value	[4]	9,528,982	9,976,563
Mortgage Revenue Bonds Held In Trust [Member] | Ocotillo Springs [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[4]	4,095,000	2,023,500
Cumulative Unrealized Gain	[4]	164,711	215,633
Estimated Fair Value	[4]	4,259,711	2,239,133
Mortgage Revenue Bonds Held In Trust [Member] | Montevista [Member] | Series A [Member] | CA [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances	[4]	6,720,000	6,720,000
Cumulative Unrealized Gain	[4]	2,086,742	2,404,771
Estimated Fair Value	[4]	8,806,742	9,124,771
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]	3,424,558	3,432,246
Cumulative Unrealized Gain	[1]	658,833	809,327
Estimated Fair Value	[1]	4,083,391	4,241,573
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]	2,933,731	2,942,370
Cumulative Unrealized Gain	[2]	637,675	724,678
Estimated Fair Value	[2]	3,571,406	3,667,048
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]	4,225,061	4,236,876
Cumulative Unrealized Gain	[1]	1,076,658	1,180,122
Estimated Fair Value	[1]	5,301,719	5,416,998
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]	7,218,027	7,233,993
Cumulative Unrealized Gain	[1]	1,508,466	1,836,808
Estimated Fair Value	[1]	8,726,493	9,070,801
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]	12,152,801	12,179,682
Cumulative Unrealized Gain	[1]	2,428,465	2,973,846
Estimated Fair Value	[1]	14,581,266	15,153,528
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]	6,302,983	6,316,993
Cumulative Unrealized Gain	[1]	1,165,385	1,470,689
Estimated Fair Value	[1]	7,468,368	7,787,682
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]	3,507,305	3,517,919
Cumulative Unrealized Gain	[1]	716,843	888,485
Estimated Fair Value	[1]	4,224,148	4,406,404
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]	3,027,355	3,034,084
Cumulative Unrealized Gain	[1]	614,256	735,450
Estimated Fair Value	[1]	3,641,611	3,769,534
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]	5,749,890	5,767,938
Cumulative Unrealized Gain	[3]	829,871	939,214
Estimated Fair Value	[3]	6,579,761	6,707,152
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	[4]	3,961,901	3,969,173
Cumulative Unrealized Gain	[4]	977,393	1,226,058
Estimated Fair Value	[4]	4,939,294	5,195,231
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]	3,757,543	3,769,337
Cumulative Unrealized Gain	[3]	777,054	859,860
Estimated Fair Value	[3]	4,534,597	4,629,197
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	[5]	7,364,956	7,374,252
Cumulative Unrealized Gain	[5]	1,903,297	2,201,663
Estimated Fair Value	[5]	9,268,253	9,575,915
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]	4,955,000	4,955,000
Cumulative Unrealized Gain	[3]	572,032	641,581
Estimated Fair Value	[3]	5,527,032	5,596,581
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]	10,836,857	10,870,681
Cumulative Unrealized Gain	[2]	3,683,524	4,293,328
Estimated Fair Value	[2]	14,520,381	15,164,009
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	[4]	36,218,314	36,234,756
Estimated Fair Value	[4]	36,218,314	36,234,756
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	[5]	4,120,000	4,120,000
Cumulative Unrealized Gain	[5]	13,341	56,458
Estimated Fair Value	[5]	4,133,341	4,176,458
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	[4]	2,600,000	2,600,000
Cumulative Unrealized Gain	[4]	131,447	136,612
Estimated Fair Value	[4]	2,731,447	2,736,612
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]	7,802,000	7,829,000
Cumulative Unrealized Gain	[3]	557,051	663,781
Estimated Fair Value	[3]	8,359,051	8,492,781
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	[4]	3,450,000	3,450,000
Cumulative Unrealized Gain	[4]	174,419	178,960
Estimated Fair Value	[4]	3,624,419	3,628,960
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]	7,681,225	7,697,891
Cumulative Unrealized Gain	[2]	1,851,589	1,995,694
Estimated Fair Value	[2]	9,532,814	9,693,585
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	[6]	16,159,797	16,189,074
Cumulative Unrealized Gain	[6]	4,151,656	4,879,623
Estimated Fair Value	[6]	20,311,453	21,068,697
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	[5]	13,688,000	13,724,000
Cumulative Unrealized Gain	[5]		61,243
Estimated Fair Value	[5]	13,688,000	13,785,243
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	[5]	7,190,000	7,235,000
Cumulative Unrealized Gain	[5]	71,710	153,657
Estimated Fair Value	[5]	7,261,710	7,388,657
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]	12,856,267	12,898,904
Cumulative Unrealized Gain	[1]	2,501,126	2,689,886
Estimated Fair Value	[1]	15,357,393	15,588,790
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]	11,023,297	11,055,254
Cumulative Unrealized Gain	[1]	1,890,764	2,208,446
Estimated Fair Value	[1]	12,914,061	13,263,700
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	[5]	6,133,061	6,136,261
Cumulative Unrealized Gain	[5]	2,162,011	2,277,289
Estimated Fair Value	[5]	8,295,072	8,413,550
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]	18,562,061	18,619,081
Cumulative Unrealized Gain	[3]	2,602,480	2,906,879
Estimated Fair Value	[3]	21,164,541	21,525,960
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]	9,784,362	9,802,479
Cumulative Unrealized Gain	[1]	2,030,003	1,353,745
Estimated Fair Value	[1]	11,814,365	11,156,224
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]	12,677,935	12,720,560
Cumulative Unrealized Gain	[1]	2,464,921	2,650,995
Estimated Fair Value	[1]	15,142,856	15,371,555
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]	10,872,864	10,910,733
Cumulative Unrealized Gain	[3]	2,316,451	2,704,295
Estimated Fair Value	[3]	13,189,315	13,615,028
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	[4]	9,259,206	9,259,206
Cumulative Unrealized Gain	[4]	562,960	578,247
Estimated Fair Value	[4]	9,822,166	9,837,453
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	[4]	21,551,600	21,551,600
Cumulative Unrealized Gain	[4]	1,310,337	1,345,919
Estimated Fair Value	[4]	22,861,937	22,897,519
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	[4]	13,782,171	13,815,817
Cumulative Unrealized Gain	[4]	2,695,680	3,189,896
Estimated Fair Value	[4]	16,477,851	17,005,713
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]	9,111,697	9,140,656
Cumulative Unrealized Gain	[3]	1,934,363	2,376,580
Estimated Fair Value	[3]	11,046,060	11,517,236
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]	7,365,549	7,388,262
Cumulative Unrealized Gain	[3]	1,624,288	1,854,785
Estimated Fair Value	[3]	8,989,837	9,243,047
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]	12,686,495	12,721,014
Cumulative Unrealized Gain	[2]	2,516,255	2,790,208
Estimated Fair Value	[2]	15,202,750	15,511,222
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	[4]	5,223,164	5,235,915
Cumulative Unrealized Gain	[4]	923,710	1,084,347
Estimated Fair Value	[4]	6,146,874	6,320,262
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	[4]	39,659,362	39,756,184
Cumulative Unrealized Gain	[4]	7,309,397	8,703,609
Estimated Fair Value	[4]	46,968,759	48,459,793
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]	6,359,867	6,379,479
Cumulative Unrealized Gain	[3]	1,348,568	1,601,535
Estimated Fair Value	[3]	7,708,435	7,981,014
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]	15,522,758	15,572,093
Cumulative Unrealized Gain	[3]	3,169,213	3,779,139
Estimated Fair Value	[3]	18,691,971	19,351,232
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]	5,042,621	5,058,171
Cumulative Unrealized Gain	[3]	1,133,545	1,292,513
Estimated Fair Value	[3]	6,176,166	6,350,684
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]	17,639,477	17,674,167
Cumulative Unrealized Gain	[1]	4,336,133	3,792,253
Estimated Fair Value	[1]	21,975,610	21,466,420
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]	18,750,321	18,796,773
Cumulative Unrealized Gain	[1]	4,293,867	4,888,537
Estimated Fair Value	[1]	23,044,188	23,685,310
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]	13,135,487	13,168,029
Cumulative Unrealized Gain	[1]	3,121,179	3,543,909
Estimated Fair Value	[1]	16,256,666	16,711,938
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]	20,348,276	20,398,687
Cumulative Unrealized Gain	[1]	4,747,239	5,397,326
Estimated Fair Value	[1]	25,095,515	25,796,013
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]	7,312,727	7,331,821
Cumulative Unrealized Gain	[1]	1,495,203	1,810,458
Estimated Fair Value	[1]	8,807,930	9,142,279
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]	22,222,763	22,270,729
Cumulative Unrealized Gain	[1]	4,918,525	5,600,721
Estimated Fair Value	[1]	27,141,288	27,871,450
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]	19,182,510	19,218,417
Cumulative Unrealized Gain	[1]	5,213,184	5,955,488
Estimated Fair Value	[1]	24,395,694	25,173,905
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]	6,694,927	6,712,409
Cumulative Unrealized Gain	[1]	1,395,575	1,600,836
Estimated Fair Value	[1]	8,090,502	8,313,245
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]	10,548,961	10,579,057
Cumulative Unrealized Gain	[2]	1,934,414	2,095,871
Estimated Fair Value	[2]	12,483,375	12,674,928
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]	12,108,609	12,135,392
Cumulative Unrealized Gain	[1]	2,081,022	2,597,201
Estimated Fair Value	[1]	14,189,631	14,732,593
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	[5]	9,805,000	9,805,000
Cumulative Unrealized Gain	[5]		105,634
Estimated Fair Value	[5]	9,805,000	9,910,634
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	[5]	11,480,404	11,462,172
Cumulative Unrealized Gain	[5]	1,735,296	1,917,286
Estimated Fair Value	[5]	13,215,700	13,379,458
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]	9,586,894	9,604,680
Cumulative Unrealized Gain	[1]	2,701,301	3,257,826
Estimated Fair Value	[1]	12,288,195	12,862,506
Mortgage Revenue Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		17,073,919	24,472,905
Cumulative Unrealized Gain		1,274,588	1,490,936
Estimated Fair Value		18,348,507	25,963,841
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		924,419	925,607
Cumulative Unrealized Gain		91,098	107,347
Estimated Fair Value		1,015,517	1,032,954
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		3,480,770	3,485,690
Cumulative Unrealized Gain			13,578
Estimated Fair Value		3,480,770	3,499,268
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		469,781	469,781
Cumulative Unrealized Gain			2,549
Estimated Fair Value		469,781	472,330
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		1,099,487	1,099,487
Cumulative Unrealized Gain			5,967
Estimated Fair Value		1,099,487	1,105,454
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		734,678	735,974
Cumulative Unrealized Gain		120,209	144,746
Estimated Fair Value		854,887	880,720
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		537,812	538,723
Cumulative Unrealized Gain		86,978	100,668
Estimated Fair Value		624,790	639,391
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		123,883	123,973
Cumulative Unrealized Gain		40,662	43,650
Estimated Fair Value		164,545	167,623
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		443,646	444,398
Cumulative Unrealized Gain		71,749	83,042
Estimated Fair Value		515,395	527,440
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		436,548	437,318
Cumulative Unrealized Gain		68,317	82,718
Estimated Fair Value		504,865	520,036
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		2,662,206	2,665,000
Cumulative Unrealized Gain		795,575	891,612
Estimated Fair Value		3,457,781	3,556,612
Mortgage Revenue Bonds [Member] | Provision Center 2014-1 [Member] | TN [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances		6,160,689	6,161,954
Estimated Fair Value		$ 6,160,689	6,161,954
Mortgage Revenue Bonds [Member] | Arby Road Apartments [Member] | Series A [Member] | NV [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost Adjusted for Paydowns and Allowances			7,385,000
Cumulative Unrealized Gain			15,059
Estimated Fair Value			$ 7,400,059

[1] MRBs owned by ATAX TEBS IV, LLC (M45 TEBS), Note 15

[2] MRBs owned by ATAX TEBS III, LLC (M33 TEBS), Note 15

[3] MRBs owned by ATAX TEBS II, LLC (M31 TEBS), Note 15

[4] MRBs held by Mizuho Capital Markets, LLC in a debt financing transaction, Note 15

[5] MRBs owned by ATAX TEBS I, LLC (M24 TEBS), Note 15

[6] MRB held by Morgan Stanley in a debt financing transaction, Note 15