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Mortgage Revenue Bonds - Description of Certain Terms of Partnership's MRBs (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Summary Of Investment Holdings [Line Items]    
Principal Outstanding $ 673,567,008 $ 679,679,604
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] $ 9,604,680 $ 9,673,117
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] $ 10,848,178 $ 10,985,959
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 [3] 2020  
Maturity Date [3] Apr. 01, 2041  
Base Interest Rate [3] 5.50%  
Principal Outstanding [3] $ 5,785,000  
Avistar at Copperfield [Member] | Series A [Member] | Houston, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [4] 2017 [5]
Maturity Date May 01, 2054 [4] May 01, 2054 [5]
Base Interest Rate 5.75% [4] 5.75% [5]
Principal Outstanding $ 13,815,817 [4] $ 13,945,681 [5]
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] $ 15,572,093 $ 15,762,217
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] $ 9,140,656 $ 9,252,257
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 $ 1,173,292 $ 1,181,107
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] $ 7,388,262 $ 7,475,794
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] $ 6,379,479 $ 6,455,058
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] $ 5,058,171 $ 5,118,097
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 $ 983,121 $ 989,411
Avistar at the Parkway [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [6] 2015 2015
Maturity Date [6] May 01, 2052 May 01, 2052
Base Interest Rate [6] 6.00% 6.00%
Principal Outstanding [6] $ 12,721,014 $ 12,854,039
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 $ 123,973 $ 124,305
Avistar at Wilcrest [Member] | Series A [Member] | Houston, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [4] 2017 [5]
Maturity Date May 01, 2054 [4] May 01, 2054 [5]
Base Interest Rate 5.75% [4] 5.75% [5]
Principal Outstanding $ 5,235,915 [4] $ 5,285,131 [5]
Avistar at Wood Hollow [Member] | Series A [Member] | Austin,TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [4] 2017 [5]
Maturity Date May 01, 2054 [4] May 01, 2054 [5]
Base Interest Rate 5.75% [4] 5.75% [5]
Principal Outstanding $ 39,756,184 [4] $ 40,129,878 [5]
Bridle Ridge [Member] | Greer, SC [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2008 2008
Maturity Date [7] Jan. 01, 2043 Jan. 01, 2043
Base Interest Rate [7] 6.00% 6.00%
Principal Outstanding [7] $ 7,235,000 $ 7,315,000
Brookstone [Member] | Waukegan, Illinois [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2009 2009
Maturity Date [7] May 01, 2040 May 01, 2040
Base Interest Rate [7] 5.45% 5.45%
Principal Outstanding [7] $ 8,652,804 $ 8,767,616
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] $ 17,674,167 $ 17,807,768
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] $ 12,775,000 $ 12,922,000
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] $ 11,055,254 $ 11,178,557
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] $ 18,796,773 $ 18,975,786
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] $ 13,168,029 $ 13,293,436
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] $ 20,398,687 $ 20,592,957
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] $ 10,061,161 $ 10,147,686
Cross Creek [Member] | Beaufort, South Carolina [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2009 2009
Maturity Date [7] Mar. 01, 2049 Mar. 01, 2049
Base Interest Rate [7] 6.15% 6.15%
Principal Outstanding [7] $ 7,862,645 $ 7,970,921
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] $ 22,270,729 $ 22,455,747
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] $ 6,621,823 $ 6,700,868
Heritage Square [Member] | Series A [Member] | Edinburg Texas    
Summary Of Investment Holdings [Line Items]    
Year Acquired [6] 2014 2014
Maturity Date [6] Sep. 01, 2051 Sep. 01, 2051
Base Interest Rate [6] 6.00% 6.00%
Principal Outstanding [6] $ 10,579,057 $ 10,695,037
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] $ 7,331,821 $ 7,405,406
Gateway Village [Member] | Durham, North Carolina [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2019 [4] 2019 [2],[8]
Maturity Date Apr. 01, 2032 [4] Apr. 01, 2032 [2],[8]
Base Interest Rate 6.10% [4] 6.10% [2],[8]
Principal Outstanding $ 2,600,000 [4] $ 2,600,000 [2],[8]
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] $ 19,218,417 $ 19,356,959
Glenview Apartments [Member] | Series A [Member] | Cameron California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [6] 2014 2014
Maturity Date [6] Dec. 01, 2031 Dec. 01, 2031
Base Interest Rate [6] 5.75% 5.75%
Principal Outstanding [6] $ 4,483,154 $ 4,533,958
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] $ 7,829,000 $ 7,936,000
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 $ 925,607 $ 930,016
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] $ 3,668,439 $ 3,699,987
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] $ 6,712,409 $ 6,779,777
Renaissance [Member] | Series A [Member] | Baton Rouge, Louisiana [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [6] 2015 2015
Maturity Date [6] Jun. 01, 2050 Jun. 01, 2050
Base Interest Rate [6] 6.00% 6.00%
Principal Outstanding [6] $ 10,870,681 $ 11,001,027
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] $ 6,791,096 $ 6,849,214
Runnymede [Member] | Austin,TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2007 2007
Maturity Date [7] Oct. 01, 2042 Oct. 01, 2042
Base Interest Rate [7] 6.00% 6.00%
Principal Outstanding [7] $ 9,805,000 $ 9,925,000
Southpark [Member] | Austin,TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2009 2009
Maturity Date [7] Dec. 01, 2049 Dec. 01, 2049
Base Interest Rate [7] 6.13% 6.13%
Principal Outstanding [7] $ 12,845,000 $ 13,005,000
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] $ 1,664,566 $ 1,679,022
Live 929 Apartments [Member] | Baltimore Maryland    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2014 [4] 2014 [9]
Maturity Date Jul. 01, 2049 [4] Jul. 01, 2049 [9]
Base Interest Rate 5.78% [4] 5.78% [9]
Principal Outstanding $ 39,465,000 [4] $ 39,685,000 [9]
Lynnhaven Apartments [Member] | Durham, North Carolina [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2019 [4] 2019 [2],[8]
Maturity Date Apr. 01, 2032 [4] Apr. 01, 2032 [2],[8]
Base Interest Rate 6.10% [4] 6.10% [2],[8]
Principal Outstanding $ 3,450,000 [4] $ 3,450,000 [2],[8]
Montclair Apartments [Member] | Series A [Member] | Lemoore California    
Summary Of Investment Holdings [Line Items]    
Year Acquired [6] 2014 2014
Maturity Date [6] Dec. 01, 2031 Dec. 01, 2031
Base Interest Rate [6] 5.75% 5.75%
Principal Outstanding [6] $ 2,428,775 $ 2,456,298
Montecito at Williams Ranch Apartments [Member] | Series A [Member] | Salinas California    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [4] 2017 [9]
Maturity Date Oct. 01, 2034 [4] Oct. 01, 2034 [9]
Base Interest Rate 5.50% [4] 5.50% [9]
Principal Outstanding $ 7,626,287 [4] $ 7,681,146 [9]
Montevista [Member] | Series A [Member] | San Pablo, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2019 [4] 2019
Maturity Date Jul. 01, 2036 [4] Jul. 01, 2036
Base Interest Rate 5.75% [4] 5.75%
Principal Outstanding $ 6,720,000 [4] $ 6,720,000
Montevista [Member] | Series B [Member] | San Pablo, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired   2019
Maturity Date   Jul. 01, 2021
Base Interest Rate   5.75%
Principal Outstanding   $ 6,480,000
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] $ 12,135,392 $ 12,239,247
Ohio Properties [Member] | Series A [Member] | OH [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2010 2010
Maturity Date [7] Jun. 01, 2050 Jun. 01, 2050
Base Interest Rate [7] 7.00% 7.00%
Principal Outstanding [7] $ 13,724,000 $ 13,857,000
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 $ 3,485,690 $ 3,504,170
Ocotillo Springs [Member] | Series A [Member] | Brawley, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [4] 2020  
Maturity Date [4] Aug. 01, 2037  
Base Interest Rate [4] 4.55%  
Principal Outstanding [4] $ 2,023,500  
Woodlynn Village [Member] | Maplewood Minnesota    
Summary Of Investment Holdings [Line Items]    
Year Acquired [7] 2008 2008
Maturity Date [7] Nov. 01, 2042 Nov. 01, 2042
Base Interest Rate [7] 6.00% 6.00%
Principal Outstanding [7] $ 4,120,000 $ 4,172,000
Provision Center 2014-1 [Member] | Knoxville Tennessee    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2014 2014 [8]
Maturity Date May 01, 2034 May 01, 2034 [8]
Base Interest Rate 6.00% 6.00% [8]
Principal Outstanding $ 10,000,000 $ 10,000,000 [8]
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] $ 4,236,876 $ 4,282,477
Silver Moon [Member] | Series A [Member] | Albuquerque, NM [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [6] 2015 2015
Maturity Date [6] Aug. 01, 2055 Aug. 01, 2055
Base Interest Rate [6] 6.00% 6.00%
Principal Outstanding [6] $ 7,697,891 $ 7,762,116
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] $ 3,432,246 $ 3,462,053
Santa Fe Apartments [Member] | Series A [Member] | Hesperia California    
Summary Of Investment Holdings [Line Items]    
Year Acquired [6] 2014 2014
Maturity Date [6] Dec. 01, 2031 Dec. 01, 2031
Base Interest Rate [6] 5.75% 5.75%
Principal Outstanding [6] $ 2,942,370 $ 2,975,713
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] $ 3,517,919 $ 3,559,011
Rosewood Townhomes [Member] | Series A [Member] | Goose Creek South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [4] 2017 [9]
Maturity Date Jul. 01, 2055 [4] Jul. 01, 2055 [9]
Base Interest Rate 5.75% [4] 5.75% [9]
Principal Outstanding $ 9,259,206 [4] $ 9,280,000 [9]
Rosewood Townhomes [Member] | Series B [Member] | Goose Creek South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 2017
Maturity Date Aug. 01, 2055 Aug. 01, 2055
Base Interest Rate 12.00% 12.00%
Principal Outstanding $ 469,781 $ 470,000
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] $ 5,767,938 $ 5,837,595
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] $ 7,233,993 $ 7,295,901
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] $ 12,179,682 $ 12,283,916
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 $ 2,665,000 $ 2,665,000
Solano Vista [Member] | Series B [Member] | Vallejo, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired   2018
Maturity Date   Jan. 01, 2021
Base Interest Rate   5.85%
Principal Outstanding   $ 3,103,000
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] $ 3,769,337 $ 3,814,857
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] $ 12,597,000 $ 12,742,000
South Pointe Apartments [Member] | Series A [Member] | Hanahan South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [4] 2017 [9]
Maturity Date Jul. 01, 2055 [4] Jul. 01, 2055 [9]
Base Interest Rate 5.75% [4] 5.75% [9]
Principal Outstanding $ 21,551,600 [4] $ 21,600,000 [9]
South Pointe Apartments [Member] | Series B [Member] | Hanahan South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 2017
Maturity Date Aug. 01, 2055 Aug. 01, 2055
Base Interest Rate 12.00% 12.00%
Principal Outstanding $ 1,099,487 $ 1,100,000
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] $ 6,316,993 $ 6,371,318
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] $ 18,619,081 $ 18,838,478
Village at Avalon [Member] | Albuquerque, NM [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [10] 2018 2018
Maturity Date [10] Jan. 01, 2059 Jan. 01, 2059
Base Interest Rate [10] 5.80% 5.80%
Principal Outstanding [10] $ 16,189,074 $ 16,302,038
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] $ 3,034,084 $ 3,060,177
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] $ 9,802,479 $ 9,872,297
Vineyard Gardens | Series A [Member] | Oxnard, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [4] 2017 [9]
Maturity Date Jan. 01, 2035 [4] Jan. 01, 2035 [9]
Base Interest Rate 5.50% [4] 5.50% [9]
Principal Outstanding $ 3,969,173 [4] $ 3,995,000 [9]
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] $ 4,955,000 $ 5,005,000
[1]   MRB owned by ATAX TEBS IV, LLC (M45 TEBS), see Note 16
[2]   MRB owned by ATAX TEBS II, LLC (M31 TEBS), see Note 16
[3] Both MRBs are part of the same series but have different interest rates and maturity dates
[4] MRB held by Mizuho Capital Markets, LLC in a secured financing transaction, see Note 16
[5]    MRB held by Deutsche Bank in a debt financing transaction, see Note 16
[6]   MRB owned by ATAX TEBS III, LLC (M33 TEBS), see Note 16
[7]   MRB owned by ATAX TEBS I, LLC (M24 TEBS), see Note 16
[8] MRB owned by Deutsche Bank in a debt financing transaction, see Note 16
[9] MRB held by Mizuho Capital Markets, LLC in a debt financing transaction, see Note 16
[10] MRB held by Morgan Stanley in a secured financing transaction, see Note 16