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Mortgage Revenue Bonds - Description of Certain Terms of Partnership's MRBs (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Summary Of Investment Holdings [Line Items]    
Principal Outstanding $ 697,713,691 $ 673,567,008
15 West Apartments [Member] | Series A [Member] | Vancouver Washington [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2016 2016
Maturity Date [1] Jul. 01, 2054 Jul. 01, 2054
Base Interest Rate [1] 6.25% 6.25%
Principal Outstanding [1] $ 9,531,842 $ 9,604,680
Arbors at Hickory Ridge [Member] | Memphis, Tennessee [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [2] 2012 2012
Maturity Date [2] Jan. 01, 2049 Jan. 01, 2049
Base Interest Rate [2] 6.25% 6.25%
Principal Outstanding [2] $ 10,701,537 $ 10,848,178
Arby Road Apartments [Member] | Series A [Member] | Las Vegas, NV [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [3]   2020
Maturity Date [3]   Oct. 01, 2027
Base Interest Rate [3]   5.35%
Principal Outstanding [3]   $ 1,600,000
Arby Road Apartments [Member] | Series A [Member] | Las Vegas, NV [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [4]   2020
Maturity Date [4]   Apr. 01, 2041
Base Interest Rate [4]   5.50%
Principal Outstanding [4]   $ 5,785,000
Avistar at Copperfield [Member] | Series A [Member] | Houston, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [5] 2017 [6]
Maturity Date May 01, 2054 [5] May 01, 2054 [6]
Base Interest Rate 5.75% [5] 5.75% [6]
Principal Outstanding $ 13,678,286 [5] $ 13,815,817 [6]
Avistar on the Boulevard [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [2] 2013 2013
Maturity Date [2] Mar. 01, 2050 Mar. 01, 2050
Base Interest Rate [2] 6.00% 6.00%
Principal Outstanding [2] $ 15,370,243 $ 15,572,093
Avistar at the Crest [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [2] 2013 2013
Maturity Date [2] Mar. 01, 2050 Mar. 01, 2050
Base Interest Rate [2] 6.00% 6.00%
Principal Outstanding [2] $ 9,022,172 $ 9,140,656
Avistar (February 2013 Acquisition) [Member] | Series B [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2013 2013
Maturity Date Apr. 01, 2050 Apr. 01, 2050
Base Interest Rate 9.00% 9.00%
Principal Outstanding $ 1,164,744 $ 1,173,292
Avistar at the Oaks [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [2] 2013 2013
Maturity Date [2] Aug. 01, 2050 Aug. 01, 2050
Base Interest Rate [2] 6.00% 6.00%
Principal Outstanding [2] $ 7,295,334 $ 7,388,262
Avistar in 09 [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [2] 2013 2013
Maturity Date [2] Aug. 01, 2050 Aug. 01, 2050
Base Interest Rate [2] 6.00% 6.00%
Principal Outstanding [2] $ 6,299,237 $ 6,379,479
Avistar on the Hills [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [2] 2013 2013
Maturity Date [2] Aug. 01, 2050 Aug. 01, 2050
Base Interest Rate [2] 6.00% 6.00%
Principal Outstanding [2] $ 4,994,549 $ 5,058,171
Avistar (June 2013 Acquisition) [Member] | Series B [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2013 2013
Maturity Date Sep. 01, 2050 Sep. 01, 2050
Base Interest Rate 9.00% 9.00%
Principal Outstanding $ 976,241 $ 983,121
Avistar at the Parkway [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2015 2015
Maturity Date [7] May 01, 2052 May 01, 2052
Base Interest Rate [7] 6.00% 6.00%
Principal Outstanding [7] $ 12,579,783 $ 12,721,014
Avistar at the Parkway [Member] | Series B [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 2015
Maturity Date Jun. 01, 2052 Jun. 01, 2052
Base Interest Rate 12.00% 12.00%
Principal Outstanding $ 123,598 $ 123,973
Avistar at Wilcrest [Member] | Series A [Member] | Houston, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [5] 2017 [6]
Maturity Date May 01, 2054 [5] May 01, 2054 [6]
Base Interest Rate 5.75% [5] 5.75% [6]
Principal Outstanding $ 5,183,794 [5] $ 5,235,915 [6]
Avistar at Wood Hollow [Member] | Series A [Member] | Austin,TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [5] 2017 [6]
Maturity Date May 01, 2054 [5] May 01, 2054 [6]
Base Interest Rate 5.75% [5] 5.75% [6]
Principal Outstanding $ 39,360,427 [5] $ 39,756,184 [6]
Bridle Ridge [Member] | Greer, SC [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [8] 2008 2008
Maturity Date [8] Jan. 01, 2043 Jan. 01, 2043
Base Interest Rate [8] 6.00% 6.00%
Principal Outstanding [8] $ 7,145,000 $ 7,235,000
Brookstone [Member] | Waukegan, Illinois [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [8] 2009 2009
Maturity Date [8] May 01, 2040 May 01, 2040
Base Interest Rate [8] 5.45% 5.45%
Principal Outstanding [8] $ 8,531,517 $ 8,652,804
Bruton Apartments [Member] | Dallas Texas [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2014 2014
Maturity Date [1] Aug. 01, 2054 Aug. 01, 2054
Base Interest Rate [1] 6.00% 6.00%
Principal Outstanding [1] $ 17,532,185 $ 17,674,167
Columbia Gardens [Member] | Columbia South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2015 2015
Maturity Date [1] Dec. 01, 2050 Dec. 01, 2050
Base Interest Rate [1] 5.50% 5.50%
Principal Outstanding [1] $ 12,620,000 $ 12,775,000
Companion at Thornhill Apartments [Member] | Lexington, South Carolina [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2016 2016
Maturity Date [1] Jan. 01, 2052 Jan. 01, 2052
Base Interest Rate [1] 5.80% 5.80%
Principal Outstanding [1] $ 10,924,609 $ 11,055,254
Concord at Gulfgate [Member] | Series A [Member] | Houston, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2015 2015
Maturity Date [1] Feb. 01, 2032 Feb. 01, 2032
Base Interest Rate [1] 6.00% 6.00%
Principal Outstanding [1] $ 18,606,719 $ 18,796,773
Concord at Little York [Member] | Series A [Member] | Houston, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2015 2015
Maturity Date [1] Feb. 01, 2032 Feb. 01, 2032
Base Interest Rate [1] 6.00% 6.00%
Principal Outstanding [1] $ 13,034,887 $ 13,168,029
Concord at Williamcrest [Member] | Series A [Member] | Houston, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2015 2015
Maturity Date [1] Feb. 01, 2032 Feb. 01, 2032
Base Interest Rate [1] 6.00% 6.00%
Principal Outstanding [1] $ 20,192,436 $ 20,398,687
Courtyard [Member] | Series A [Member] | Fullerton California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2016 2016
Maturity Date [1] Dec. 01, 2033 Dec. 01, 2033
Base Interest Rate [1] 5.00% 5.00%
Principal Outstanding [1] $ 9,970,209 $ 10,061,161
Cross Creek [Member] | Beaufort, South Carolina [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [8] 2009 2009
Maturity Date [8] Mar. 01, 2049 Mar. 01, 2049
Base Interest Rate [8] 6.15% 6.15%
Principal Outstanding [8] $ 7,747,521 $ 7,862,645
Decatur Angle [Member] | Fort Worth, Texas [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2014 2014
Maturity Date [1] Jan. 01, 2054 Jan. 01, 2054
Base Interest Rate [1] 5.75% 5.75%
Principal Outstanding [1] $ 22,074,594 $ 22,270,729
Harden Ranch [Member] | Series A [Member] | Salinas California    
Summary Of Investment Holdings [Line Items]    
Year Acquired [2] 2014 2014
Maturity Date [2] Mar. 01, 2030 Mar. 01, 2030
Base Interest Rate [2] 5.75% 5.75%
Principal Outstanding [2] $ 6,538,111 $ 6,621,823
Heritage Square [Member] | Series A [Member] | Edinburg Texas    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2014 2014
Maturity Date [7] Sep. 01, 2051 Sep. 01, 2051
Base Interest Rate [7] 6.00% 6.00%
Principal Outstanding [7] $ 10,455,924 $ 10,579,057
Jackson Manor Apartments [Member] | Jackson, MS [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [5] 2021  
Maturity Date [5] May 01, 2038  
Base Interest Rate [5] 5.00%  
Principal Outstanding [5] $ 4,900,000  
Crossing at 1415 [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2015 2015
Maturity Date [1] Dec. 01, 2052 Dec. 01, 2052
Base Interest Rate [1] 6.00% 6.00%
Principal Outstanding [1] $ 7,253,698 $ 7,331,821
Gateway Village [Member] | Durham, North Carolina [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2019 [5] 2019 [6]
Maturity Date Apr. 01, 2032 [5] Apr. 01, 2032 [6]
Base Interest Rate 6.10% [5] 6.10% [6]
Principal Outstanding $ 2,600,000 [5] $ 2,600,000 [6]
Esperanza at Palo Alto [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2018 2018
Maturity Date [1] Jul. 01, 2058 Jul. 01, 2058
Base Interest Rate [1] 5.80% 5.80%
Principal Outstanding [1] $ 19,071,622 $ 19,218,417
Glenview Apartments [Member] | Series A [Member] | Cameron California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2014 2014
Maturity Date [7] Dec. 01, 2031 Dec. 01, 2031
Base Interest Rate [7] 5.75% 5.75%
Principal Outstanding [7] $ 4,429,350 $ 4,483,154
Greens Property [Member] | Series A [Member] | Durham, North Carolina [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [2] 2012 2012
Maturity Date [2] Oct. 01, 2047 Oct. 01, 2047
Base Interest Rate [2] 6.50% 6.50%
Principal Outstanding [2] $ 7,719,000 $ 7,829,000
Greens Property [Member] | Series B [Member] | Durham, North Carolina [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2012 2012
Maturity Date Oct. 01, 2047 Oct. 01, 2047
Base Interest Rate 12.00% 12.00%
Principal Outstanding $ 920,637 $ 925,607
Harmony Court Bakersfield [Member] | Series A [Member] | Bakersfield, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2016 2016
Maturity Date [1] Dec. 01, 2033 Dec. 01, 2033
Base Interest Rate [1] 5.00% 5.00%
Principal Outstanding [1] $ 3,635,277 $ 3,668,439
Heights at 515 [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2015 2015
Maturity Date [1] Dec. 01, 2052 Dec. 01, 2052
Base Interest Rate [1] 6.00% 6.00%
Principal Outstanding [1] $ 6,640,885 $ 6,712,409
Harmony Terrace [Member] | Series A [Member] | Simi Valley, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2016 2016
Maturity Date [1] Jan. 01, 2034 Jan. 01, 2034
Base Interest Rate [1] 5.00% 5.00%
Principal Outstanding [1] $ 6,730,004 $ 6,791,096
Las Palmas II [Member] | Series A [Member] | Coachella, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2016 2016
Maturity Date [1] Nov. 01, 2033 Nov. 01, 2033
Base Interest Rate [1] 5.00% 5.00%
Principal Outstanding [1] $ 1,649,370 $ 1,664,566
Live 929 Apartments [Member] | Series A [Member] | Baltimore Maryland    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2014 [5] 2014 [6]
Maturity Date Jul. 01, 2049 [5] Jul. 01, 2049 [6]
Base Interest Rate 5.78% [5] 5.78% [6]
Principal Outstanding $ 39,465,000 [5] $ 39,465,000 [6]
Live 929 Apartments [Member] | Series B [Member] | Baltimore Maryland    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2021  
Maturity Date Jul. 01, 2039  
Base Interest Rate 1.60%  
Principal Outstanding $ 21,680,000  
Lutheran Gardens [Member] | Series A [Member] | Compton, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2021  
Maturity Date Feb. 01, 2025  
Base Interest Rate 4.90%  
Principal Outstanding $ 10,352,000  
Lynnhaven Apartments [Member] | Durham, North Carolina [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2019 [5] 2019 [6]
Maturity Date Apr. 01, 2032 [5] Apr. 01, 2032 [6]
Base Interest Rate 6.10% [5] 6.10% [6]
Principal Outstanding $ 3,450,000 [5] $ 3,450,000 [6]
Meadow Valley [Member] | Series A [Member] | Garfield Charter Township, MI [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2021  
Maturity Date Dec. 01, 2029  
Base Interest Rate 6.25%  
Principal Outstanding $ 100,000  
Montclair Apartments [Member] | Series A [Member] | Lemoore California    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2014 2014
Maturity Date [7] Dec. 01, 2031 Dec. 01, 2031
Base Interest Rate [7] 5.75% 5.75%
Principal Outstanding [7] $ 2,399,626 $ 2,428,775
Montecito at Williams Ranch Apartments [Member] | Series A [Member] | Salinas California    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [5] 2017 [6]
Maturity Date Oct. 01, 2034 [5] Oct. 01, 2034 [6]
Base Interest Rate 5.50% [5] 5.50% [6]
Principal Outstanding $ 7,568,334 [5] $ 7,626,287 [6]
Montevista [Member] | Series A [Member] | San Pablo, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2019 [5] 2019 [6]
Maturity Date Jul. 01, 2036 [5] Jul. 01, 2036 [6]
Base Interest Rate 5.75% [5] 5.75% [6]
Principal Outstanding $ 6,701,776 [5] $ 6,720,000 [6]
Oaks at Georgetown [Member] | Series A [Member] | Georgetown, Texas [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2016 2016
Maturity Date [1] Jan. 01, 2034 Jan. 01, 2034
Base Interest Rate [1] 5.00% 5.00%
Principal Outstanding [1] $ 12,026,225 $ 12,135,392
Ocotillo Springs [Member] | Series A [Member] | Brawley, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2020 [5] 2020 [6]
Maturity Date Aug. 01, 2037 [5] Aug. 01, 2037 [6]
Base Interest Rate 4.55% [5] 4.55% [6]
Principal Outstanding $ 15,000,000 [5] $ 2,023,500 [6]
Ohio Properties [Member] | Series A [Member] | OH [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [8] 2010 2010
Maturity Date [8] Jun. 01, 2050 Jun. 01, 2050
Base Interest Rate [8] 7.00% 7.00%
Principal Outstanding [8] $ 13,580,000 $ 13,724,000
Ohio Properties [Member] | Series B [Member] | OH [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2010 2010
Maturity Date Jun. 01, 2050 Jun. 01, 2050
Base Interest Rate 10.00% 10.00%
Principal Outstanding $ 3,465,270 $ 3,485,690
Provision Center 2014-1 [Member] | Knoxville Tennessee    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2014 2014
Maturity Date May 01, 2034 May 01, 2034
Base Interest Rate 6.00% 6.00%
Principal Outstanding $ 10,000,000 $ 10,000,000
Renaissance [Member] | Series A [Member] | Baton Rouge, Louisiana [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2015 2015
Maturity Date [7] Jun. 01, 2050 Jun. 01, 2050
Base Interest Rate [7] 6.00% 6.00%
Principal Outstanding [7] $ 10,732,295 $ 10,870,681
Residency at the Mayer [Member] | Series A [Member] | Hollywood, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [5] 2021  
Maturity Date [5] Apr. 01, 2039  
Base Interest Rate [5] 3.85%  
Principal Outstanding [5] $ 24,000,000  
Rosewood Townhomes [Member] | Series A [Member] | Goose Creek South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired [6]   2017
Maturity Date [6]   Jul. 01, 2055
Base Interest Rate [6]   5.75%
Principal Outstanding [6]   $ 9,259,206
Rosewood Townhomes [Member] | Series B [Member] | Goose Creek South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired   2017
Maturity Date   Aug. 01, 2055
Base Interest Rate   12.00%
Principal Outstanding   $ 469,781
Runnymede [Member] | Austin,TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [8] 2007 2007
Maturity Date [8] Oct. 01, 2042 Oct. 01, 2042
Base Interest Rate [8] 6.00% 6.00%
Principal Outstanding [8] $ 9,675,000 $ 9,805,000
San Vicente [Member] | Series A [Member] | Soledad, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2016 2016
Maturity Date [1] Nov. 01, 2033 Nov. 01, 2033
Base Interest Rate [1] 5.00% 5.00%
Principal Outstanding [1] $ 3,400,913 $ 3,432,246
Santa Fe Apartments [Member] | Series A [Member] | Hesperia California    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2014 2014
Maturity Date [7] Dec. 01, 2031 Dec. 01, 2031
Base Interest Rate [7] 5.75% 5.75%
Principal Outstanding [7] $ 2,907,057 $ 2,942,370
Seasons at Simi Valley [Member] | Series A [Member] | Simi Valley, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2015 2015
Maturity Date [1] Sep. 01, 2032 Sep. 01, 2032
Base Interest Rate [1] 5.75% 5.75%
Principal Outstanding [1] $ 4,188,582 $ 4,236,876
Seasons Lakewood [Member] | Series A [Member] | Lakewood, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2016 2016
Maturity Date [1] Jan. 01, 2034 Jan. 01, 2034
Base Interest Rate [1] 5.00% 5.00%
Principal Outstanding [1] $ 7,168,917 $ 7,233,993
Seasons San Juan Capistrano [Member] | Series A [Member] | San Juan Capistrano California    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2016 2016
Maturity Date [1] Jan. 01, 2034 Jan. 01, 2034
Base Interest Rate [1] 5.00% 5.00%
Principal Outstanding [1] $ 12,070,116 $ 12,179,682
Silver Moon [Member] | Series A [Member] | Albuquerque, NM [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2015 2015
Maturity Date [7] Aug. 01, 2055 Aug. 01, 2055
Base Interest Rate [7] 6.00% 6.00%
Principal Outstanding [7] $ 7,629,704 $ 7,697,891
Solano Vista [Member] | Series A [Member] | Vallejo, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2018 2018
Maturity Date Jan. 01, 2036 Jan. 01, 2036
Base Interest Rate 5.85% 5.85%
Principal Outstanding $ 2,649,291 $ 2,665,000
South Pointe Apartments [Member] | Series A [Member] | Hanahan South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired [6]   2017
Maturity Date [6]   Jul. 01, 2055
Base Interest Rate [6]   5.75%
Principal Outstanding [6]   $ 21,551,600
South Pointe Apartments [Member] | Series B [Member] | Hanahan South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired   2017
Maturity Date   Aug. 01, 2055
Base Interest Rate   12.00%
Principal Outstanding   $ 1,099,487
Southpark [Member] | Austin,TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [8] 2009 2009
Maturity Date [8] Dec. 01, 2049 Dec. 01, 2049
Base Interest Rate [8] 6.13% 6.13%
Principal Outstanding [8] $ 12,675,000 $ 12,845,000
Summerhill [Member] | Series A [Member] | Bakersfield, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2016 2016
Maturity Date [1] Dec. 01, 2033 Dec. 01, 2033
Base Interest Rate [1] 5.00% 5.00%
Principal Outstanding [1] $ 6,259,888 $ 6,316,993
Sycamore Walk [Member] | Series A [Member] | Bakersfield, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2015 2015
Maturity Date [1] Jan. 01, 2033 Jan. 01, 2033
Base Interest Rate [1] 5.25% 5.25%
Principal Outstanding [1] $ 3,474,617 $ 3,517,919
The Palms at Premier Park Apartments | Columbia South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired [2] 2013 2013
Maturity Date [2] Jan. 01, 2050 Jan. 01, 2050
Base Interest Rate [2] 6.25% 6.25%
Principal Outstanding [2] $ 18,385,572 $ 18,619,081
Tyler Park Townhomes [Member] | Greenfield California    
Summary Of Investment Holdings [Line Items]    
Year Acquired [2] 2013 2013
Maturity Date [2] Jan. 01, 2030 Jan. 01, 2030
Base Interest Rate [2] 5.75% 5.75%
Principal Outstanding [2] $ 5,694,168 $ 5,767,938
Village at Avalon [Member] | Albuquerque, NM [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2018 [9] 2018 [10]
Maturity Date Jan. 01, 2059 [9] Jan. 01, 2059 [10]
Base Interest Rate 5.80% [9] 5.80% [10]
Principal Outstanding $ 16,069,382 [9] $ 16,189,074 [10]
The Village at Madera [Member] | Series A [Member] | Madera, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2016 2016
Maturity Date [1] Dec. 01, 2033 Dec. 01, 2033
Base Interest Rate [1] 5.00% 5.00%
Principal Outstanding [1] $ 3,006,656 $ 3,034,084
Village at River's Edge [Member] | Columbia South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2017 2017
Maturity Date [1] Jun. 01, 2033 Jun. 01, 2033
Base Interest Rate [1] 6.00% 6.00%
Principal Outstanding [1] $ 9,728,355 $ 9,802,479
Vineyard Gardens | Series A [Member] | Oxnard, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [5] 2017 [6]
Maturity Date Jan. 01, 2035 [5] Jan. 01, 2035 [6]
Base Interest Rate 5.50% [5] 5.50% [6]
Principal Outstanding $ 3,939,476 [5] $ 3,969,173 [6]
Westside Village Market [Member] | Shafter California    
Summary Of Investment Holdings [Line Items]    
Year Acquired [2] 2013 2013
Maturity Date [2] Jan. 01, 2030 Jan. 01, 2030
Base Interest Rate [2] 5.75% 5.75%
Principal Outstanding [2] $ 3,721,129 $ 3,769,337
Willow Run [Member] | Columbia South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired [1] 2015 2015
Maturity Date [1] Dec. 01, 2050 Dec. 01, 2050
Base Interest Rate [1] 5.50% 5.50%
Principal Outstanding [1] $ 12,444,000 $ 12,597,000
Woodlynn Village [Member] | Maplewood Minnesota    
Summary Of Investment Holdings [Line Items]    
Year Acquired [8]   2008
Maturity Date [8]   Nov. 01, 2042
Base Interest Rate [8]   6.00%
Principal Outstanding [8]   $ 4,120,000
Copper Gate Apartments [Member] | Lafayette, Indiana [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [2] 2013 2013
Maturity Date [2] Dec. 01, 2029 Dec. 01, 2029
Base Interest Rate [2] 6.25% 6.25%
Principal Outstanding [2] $ 4,900,000 $ 4,955,000
[1] MRB owned by ATAX TEBS IV, LLC (M45 TEBS), Note 16
[2] MRB owned by ATAX TEBS II, LLC (M31 TEBS), Note 16
[3] Both MRBs are part of the same series but had different interest rates and maturity dates.
[4] Both MRBs are part of the same series but have different interest rates and maturity dates.
[5] MRB held by Mizuho Capital Markets, LLC in a secured financing transaction, Note 16
[6] MRB held by Mizuho Capital Markets, LLC in a debt financing transaction, Note 16
[7] MRB owned by ATAX TEBS III, LLC (M33 TEBS), Note 16
[8] MRB owned by ATAX TEBS I, LLC (M24 TEBS), Note 16
[9] MRB held by Morgan Stanley in a secured financing transaction, Note 16
[10] MRB held by Morgan Stanley in a debt financing transaction, Note 16