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Mortgage Revenue Bonds - Description of Certain Terms of Partnership's MRBs (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Summary Of Investment Holdings [Line Items]    
Principal Outstanding $ 884,664,326 $ 771,014,252
15 West Apartments [Member] | Series A [Member] | Vancouver Washington [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2016 [1] 2016 [2]
Maturity Date Jul. 01, 2054 [1] Jul. 01, 2054 [2]
Base Interest Rate 6.25% [1] 6.25% [2]
Principal Outstanding $ 9,371,808 [1] $ 9,454,318 [2]
40rty on Colony [Member] | Series P [Member] | La Mesa, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [3] 2023  
Maturity Date [3] Jun. 01, 2030  
Base Interest Rate [3] 7.05%  
Principal Outstanding [3] $ 5,950,000  
Arbors at Hickory Ridge [Member] | Memphis, Tennessee [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2012 [4] 2012 [5]
Maturity Date Jan. 01, 2049 [4] Jan. 01, 2049 [5]
Base Interest Rate 6.25% [4] 6.25% [5]
Principal Outstanding $ 10,379,348 [4] $ 10,545,462 [5]
Avistar at Copperfield [Member] | Series A [Member] | Houston, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [3] 2017 [6]
Maturity Date May 01, 2054 [3] May 01, 2054 [6]
Base Interest Rate 5.75% [3] 5.75% [6]
Principal Outstanding $ 13,378,386 [3] $ 13,532,636 [6]
Avistar on the Boulevard [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2013 [4] 2013 [5]
Maturity Date Mar. 01, 2050 [4] Mar. 01, 2050 [5]
Base Interest Rate 6.00% [4] 6.00% [5]
Principal Outstanding $ 14,928,425 [4] $ 15,155,942 [5]
Avistar at the Crest [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2013 [4] 2013 [5]
Maturity Date Mar. 01, 2050 [4] Mar. 01, 2050 [5]
Base Interest Rate 6.00% [4] 6.00% [5]
Principal Outstanding $ 8,762,826 [4] $ 8,896,378 [5]
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 $ 1,145,167 $ 1,155,394
Avistar at the Oaks [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2013 [4] 2013 [5]
Maturity Date Aug. 01, 2050 [4] Aug. 01, 2050 [5]
Base Interest Rate 6.00% [4] 6.00% [5]
Principal Outstanding $ 7,091,928 [4] $ 7,196,674 [5]
Avistar in 09 [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2013 [4] 2013 [5]
Maturity Date Aug. 01, 2050 [4] Aug. 01, 2050 [5]
Base Interest Rate 6.00% [4] 6.00% [5]
Principal Outstanding $ 6,123,600 [4] $ 6,214,048 [5]
Avistar on the Hills [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2013 [4] 2013 [5]
Maturity Date Aug. 01, 2050 [4] Aug. 01, 2050 [5]
Base Interest Rate 6.00% [4] 6.00% [5]
Principal Outstanding $ 4,855,291 [4] $ 4,927,003 [5]
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 $ 960,483 $ 968,715
Avistar at the Parkway [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 [7] 2015 [8]
Maturity Date May 01, 2052 [7] May 01, 2052 [8]
Base Interest Rate 6.00% [7] 6.00% [8]
Principal Outstanding $ 12,270,653 [7] $ 12,429,842 [8]
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 $ 122,701 $ 123,176
Avistar at Wilcrest [Member] | Series A [Member] | Houston, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [3] 2017 [6]
Maturity Date May 01, 2054 [3] May 01, 2054 [6]
Base Interest Rate 5.75% [3] 5.75% [6]
Principal Outstanding $ 5,070,137 [3] $ 5,128,595 [6]
Avistar at Wood Hollow [Member] | Series A [Member] | Austin,TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [3] 2017 [6]
Maturity Date May 01, 2054 [3] May 01, 2054 [6]
Base Interest Rate 5.75% [3] 5.75% [6]
Principal Outstanding $ 38,497,436 [3] $ 38,941,304 [6]
Brookstone [Member] | Waukegan, Illinois [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2009 2009 [9]
Maturity Date May 01, 2040 May 01, 2040 [9]
Base Interest Rate 5.45% 5.45% [9]
Principal Outstanding $ 8,268,029 $ 8,403,386 [9]
Bruton Apartments [Member] | Dallas Texas [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2014 [1] 2014 [2]
Maturity Date Aug. 01, 2054 [1] Aug. 01, 2054 [2]
Base Interest Rate 6.00% [1] 6.00% [2]
Principal Outstanding $ 17,220,941 [1] $ 17,381,296 [2]
CCBA Senior Garden Apartments [Member] | San Diego, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2022 2022
Maturity Date Jul. 01, 2037 Jul. 01, 2037
Base Interest Rate 4.50% 4.50%
Principal Outstanding $ 3,757,268 $ 3,792,700
Columbia Gardens [Member] | Columbia South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 [1] 2015 [2]
Maturity Date Dec. 01, 2050 [1] Dec. 01, 2050 [2]
Base Interest Rate 5.50% [1] 5.50% [2]
Principal Outstanding $ 12,282,000 [1] $ 12,455,000 [2]
Companion at Thornhill Apartments [Member] | Lexington, South Carolina [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2016 [1] 2016 [2]
Maturity Date Jan. 01, 2052 [1] Jan. 01, 2052 [2]
Base Interest Rate 5.80% [1] 5.80% [2]
Principal Outstanding $ 10,639,506 [1] $ 10,786,181 [2]
Concord at Gulfgate [Member] | Series A [Member] | Houston, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 [1] 2015 [2]
Maturity Date Feb. 01, 2032 [1] Feb. 01, 2032 [2]
Base Interest Rate 6.00% [1] 6.00% [2]
Principal Outstanding $ 18,190,721 [1] $ 18,404,942 [2]
Concord at Little York [Member] | Series A [Member] | Houston, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 [1] 2015 [2]
Maturity Date Feb. 01, 2032 [1] Feb. 01, 2032 [2]
Base Interest Rate 6.00% [1] 6.00% [2]
Principal Outstanding $ 12,743,460 [1] $ 12,893,533 [2]
Concord at Williamcrest [Member] | Series A [Member] | Houston, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 [1] 2015 [2]
Maturity Date Feb. 01, 2032 [1] Feb. 01, 2032 [2]
Base Interest Rate 6.00% [1] 6.00% [2]
Principal Outstanding $ 19,740,985 [1] $ 19,973,464 [2]
Courtyard [Member] | Series A [Member] | Fullerton California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2016 [1] 2016 [2]
Maturity Date Dec. 01, 2033 [1] Dec. 01, 2033 [2]
Base Interest Rate 5.00% [1] 5.00% [2]
Principal Outstanding $ 9,774,107 [1] $ 9,874,603 [2]
Decatur Angle [Member] | Fort Worth, Texas [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2014 [1] 2014 [2]
Maturity Date Jan. 01, 2054 [1] Jan. 01, 2054 [2]
Base Interest Rate 5.75% [1] 5.75% [2]
Principal Outstanding $ 21,646,255 [1] $ 21,866,672 [2]
Harden Ranch [Member] | Series A [Member] | Salinas California    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2014 [4] 2014 [5]
Maturity Date Mar. 01, 2030 [4] Mar. 01, 2030 [5]
Base Interest Rate 5.75% [4] 5.75% [5]
Principal Outstanding $ 6,355,567 [4] $ 6,449,455 [5]
Heritage Square [Member] | Series A [Member] | Edinburg Texas    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2014 [7] 2014 [8]
Maturity Date Sep. 01, 2051 [7] Sep. 01, 2051 [8]
Base Interest Rate 6.00% [7] 6.00% [8]
Principal Outstanding $ 10,186,405 [7] $ 10,325,196 [8]
Jackson Manor Apartments [Member] | Jackson, MS [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2021 [3] 2021 [6]
Maturity Date May 01, 2038 [3] May 01, 2038 [6]
Base Interest Rate 5.00% [3] 5.00% [6]
Principal Outstanding $ 4,824,474 [3] $ 6,900,000 [6]
Crossing at 1415 [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 [1] 2015 [2]
Maturity Date Dec. 01, 2052 [1] Dec. 01, 2052 [2]
Base Interest Rate 6.00% [1] 6.00% [2]
Principal Outstanding $ 7,082,698 [1] $ 7,170,756 [2]
Esperanza at Palo Alto [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2018 [1] 2018 [2]
Maturity Date Jul. 01, 2058 [1] Jul. 01, 2058 [2]
Base Interest Rate 5.80% [1] 5.80% [2]
Principal Outstanding $ 18,751,278 [1] $ 18,916,082 [2]
Glenview Apartments [Member] | Series A [Member] | Cameron California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2014 [7] 2014 [8]
Maturity Date Dec. 01, 2031 [7] Dec. 01, 2031 [8]
Base Interest Rate 5.75% [7] 5.75% [8]
Principal Outstanding $ 4,312,025 [7] $ 4,372,370 [8]
Greens Property [Member] | Series A [Member] | Durham, North Carolina [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [5]   2012
Maturity Date [5]   Oct. 01, 2047
Base Interest Rate [5]   6.50%
Principal Outstanding [5]   $ 7,599,000
Greens Property [Member] | Series B [Member] | Durham, North Carolina [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired   2012
Maturity Date   Oct. 01, 2047
Base Interest Rate   12.00%
Principal Outstanding   $ 915,039
Handsel Morgan Village Apartments [Member] | Buford, Georgia [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2023  
Maturity Date Mar. 01, 2041  
Base Interest Rate 6.75%  
Principal Outstanding $ 2,150,000  
Harmony Court Bakersfield [Member] | Series A [Member] | Bakersfield, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2016 [1] 2016 [2]
Maturity Date Dec. 01, 2033 [1] Dec. 01, 2033 [2]
Base Interest Rate 5.00% [1] 5.00% [2]
Principal Outstanding $ 3,563,775 [1] $ 3,600,418 [2]
Heights at 515 [Member] | Series A [Member] | San Antonio, TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 [1] 2015 [2]
Maturity Date Dec. 01, 2052 [1] Dec. 01, 2052 [2]
Base Interest Rate 6.00% [1] 6.00% [2]
Principal Outstanding $ 6,484,332 [1] $ 6,564,951 [2]
Harmony Terrace [Member] | Series A [Member] | Simi Valley, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2016 [1] 2016 [2]
Maturity Date Jan. 01, 2034 [1] Jan. 01, 2034 [2]
Base Interest Rate 5.00% [1] 5.00% [2]
Principal Outstanding $ 6,598,285 [1] $ 6,665,787 [2]
The Ivy Apartments [Member] | Greenville, SC [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [3] 2023  
Maturity Date [3] Feb. 01, 2030  
Base Interest Rate [3] 6.50%  
Principal Outstanding [3] $ 30,500,000  
Las Palmas II [Member] | Series A [Member] | Coachella, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2016 [1] 2016 [2]
Maturity Date Nov. 01, 2033 [1] Nov. 01, 2033 [2]
Base Interest Rate 5.00% [1] 5.00% [2]
Principal Outstanding $ 1,616,607 [1] $ 1,633,397 [2]
Live 929 Apartments [Member] | Series A [Member] | Baltimore Maryland    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2022 [3] 2022 [6]
Maturity Date Jan. 01, 2060 [3] Jan. 01, 2060 [6]
Base Interest Rate 4.30% [3] 4.30% [6]
Principal Outstanding $ 66,365,000 [3] $ 66,365,000 [6]
Lutheran Gardens [Member] | Compton, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2021 [10] 2021 [11]
Maturity Date Feb. 01, 2025 [10] Feb. 01, 2025 [11]
Base Interest Rate 4.90% [10] 4.90% [11]
Principal Outstanding $ 10,352,000 [10] $ 10,352,000 [11]
Maryalice Circle Apartments [Member] | Buford, Georgia [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [3] 2023  
Maturity Date [3] Mar. 01, 2041  
Base Interest Rate [3] 6.75%  
Principal Outstanding [3] $ 5,900,000  
Meadow Valley [Member] | Garfield Charter Township, MI [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2021 [3] 2021
Maturity Date Dec. 01, 2029 [3] Dec. 01, 2029
Base Interest Rate 6.25% [3] 6.25%
Principal Outstanding $ 20,755,000 [3] $ 4,723,437
Montclair Apartments [Member] | Series A [Member] | Lemoore California    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2014 [7] 2014 [8]
Maturity Date Dec. 01, 2031 [7] Dec. 01, 2031 [8]
Base Interest Rate 5.75% [7] 5.75% [8]
Principal Outstanding $ 2,336,065 [7] $ 2,368,757 [8]
Montecito at Williams Ranch Apartments [Member] | Series A [Member] | Salinas California    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [3] 2017 [6]
Maturity Date Oct. 01, 2034 [3] Oct. 01, 2034 [6]
Base Interest Rate 5.50% [3] 5.50% [6]
Principal Outstanding $ 7,442,435 [3] $ 7,507,111 [6]
Montevista [Member] | Series A [Member] | San Pablo, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2019 [3] 2019 [6]
Maturity Date Jul. 01, 2036 [3] Jul. 01, 2036 [6]
Base Interest Rate 5.75% [3] 5.75% [6]
Principal Outstanding $ 6,607,973 [3] $ 6,656,219 [6]
Oaks at Georgetown [Member] | Series A [Member] | Georgetown, Texas [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2016 [1] 2016 [2]
Maturity Date Jan. 01, 2034 [1] Jan. 01, 2034 [2]
Base Interest Rate 5.00% [1] 5.00% [2]
Principal Outstanding $ 11,790,848 [1] $ 11,911,472 [2]
Ocotillo Springs [Member] | Series A [Member] | Brawley, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2020 2020 [6]
Maturity Date Aug. 01, 2038 Aug. 01, 2037 [6]
Base Interest Rate 4.35%  
Principal Outstanding $ 3,489,096 $ 11,090,000 [6]
Ocotillo Springs [Member] | Series A [Member] | Brawley, CA [Member] | LIBOR [Member]    
Summary Of Investment Holdings [Line Items]    
Base Interest Rate [6]   3.25%
Ocotillo Springs [Member] | Series A-1 [Member] | Brawley, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2023  
Maturity Date Aug. 01, 2038  
Base Interest Rate 6.50%  
Principal Outstanding $ 499,117  
Park at Sondrio - Series 2022A | Greenville, SC [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2022 [3] 2022 [6]
Maturity Date Jan. 01, 2030 [3] Jan. 01, 2030 [6]
Base Interest Rate 6.50% [3] 6.50% [6]
Principal Outstanding $ 38,100,000 [3] $ 38,100,000 [6]
Park at Vietti - Series 2022A | Spartanburg, SC [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2022 [3] 2022 [6]
Maturity Date Jan. 01, 2030 [3] Jan. 01, 2030 [6]
Base Interest Rate 6.50% [3] 6.50% [6]
Principal Outstanding $ 26,985,000 [3] $ 26,985,000 [6]
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 $ 6,636,596 $ 10,000,000
Renaissance [Member] | Series A [Member] | Baton Rouge, Louisiana [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 [7] 2015 [8]
Maturity Date Jun. 01, 2050 [7] Jun. 01, 2050 [8]
Base Interest Rate 6.00% [7] 6.00% [8]
Principal Outstanding $ 10,429,392 [7] $ 10,585,375 [8]
Residency at Empire - Series BB-1 [Member] | Burbank, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2022 [3] 2022
Maturity Date Dec. 01, 2040 [3] Dec. 01, 2040
Base Interest Rate 6.45% [3] 6.45%
Principal Outstanding $ 14,000,000 [3] $ 14,000,000
Residency at Empire - Series BB-2 [Member] | Burbank, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2022 [3] 2022
Maturity Date Dec. 01, 2040 [3] Dec. 01, 2040
Base Interest Rate 6.45% [3] 6.45%
Principal Outstanding $ 4,000,000 [3] $ 4,000,000
Residency at Empire - Series BB-3 [Member] | Burbank, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2022 [3] 2022
Maturity Date Dec. 01, 2040 [3] Dec. 01, 2040
Base Interest Rate 6.45% [3] 6.45%
Principal Outstanding $ 5,055,000 [3] $ 55,000
Residency at the Mayer [Member] | Series A [Member] | Hollywood, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2021 [3] 2021 [6]
Maturity Date Apr. 01, 2039 [3] Apr. 01, 2039 [6]
Principal Outstanding $ 29,500,000 [3] $ 26,000,000 [6]
Residency at the Mayer [Member] | Series A [Member] | Hollywood, CA [Member] | SOFR [Member]    
Summary Of Investment Holdings [Line Items]    
Base Interest Rate 3.60% 3.60% [6]
Residency at the Entrepreneur J -1 [Member] | Los Angeles, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2022 [3] 2022 [6]
Maturity Date Mar. 31, 2040 [3] Mar. 31, 2040 [6]
Base Interest Rate 6.00% [3] 6.00% [6]
Principal Outstanding $ 9,000,000 [3] $ 9,000,000 [6]
Residency at the Entrepreneur J -2 [Member] | Los Angeles, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2022 [3] 2022 [6]
Maturity Date Mar. 31, 2040 [3] Mar. 31, 2040 [6]
Base Interest Rate 6.00% [3] 6.00% [6]
Principal Outstanding $ 7,500,000 [3] $ 7,500,000 [6]
Residency at the Entrepreneur J -3 [Member] | Los Angeles, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2022 [3] 2022 [6]
Maturity Date Mar. 31, 2040 [3] Mar. 31, 2040 [6]
Base Interest Rate 6.00% [3] 6.00% [6]
Principal Outstanding $ 12,300,000 [3] $ 3,900,000 [6]
Residency At The Entrepreneur J-5 [Member] | Los Angeles, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2023  
Maturity Date Apr. 01, 2025  
Principal Outstanding $ 1,000,000  
Residency At The Entrepreneur J-5 [Member] | Los Angeles, CA [Member] | SOFR [Member]    
Summary Of Investment Holdings [Line Items]    
Base Interest Rate 3.60%  
Runnymede [Member] | Austin,TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2007 2007 [9]
Maturity Date Oct. 01, 2024 Oct. 01, 2024 [9]
Base Interest Rate 6.00% 6.00% [9]
Principal Outstanding $ 9,390,000 $ 9,535,000 [9]
The Safford [Member] | Marana, AZ [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [3] 2023  
Maturity Date [3] Oct. 10, 2026  
Base Interest Rate [3] 7.59%  
Principal Outstanding [3] $ 7,560,034  
San Vicente [Member] | Series A [Member] | Soledad, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2016 [1] 2016 [2]
Maturity Date Nov. 01, 2033 [1] Nov. 01, 2033 [2]
Base Interest Rate 5.00% [1] 5.00% [2]
Principal Outstanding $ 3,333,357 [1] $ 3,367,978 [2]
Santa Fe Apartments [Member] | Series A [Member] | Hesperia California    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2014 [7] 2014 [8]
Maturity Date Dec. 01, 2031 [7] Dec. 01, 2031 [8]
Base Interest Rate 5.75% [7] 5.75% [8]
Principal Outstanding $ 2,830,055 [7] $ 2,869,660 [8]
Seasons at Simi Valley [Member] | Series A [Member] | Simi Valley, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 [1] 2015 [2]
Maturity Date Sep. 01, 2032 [1] Sep. 01, 2032 [2]
Base Interest Rate 5.75% [1] 5.75% [2]
Principal Outstanding $ 4,083,273 [1] $ 4,137,438 [2]
Seasons Lakewood [Member] | Series A [Member] | Lakewood, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2016 [1] 2016 [2]
Maturity Date Jan. 01, 2034 [1] Jan. 01, 2034 [2]
Base Interest Rate 5.00% [1] 5.00% [2]
Principal Outstanding $ 7,028,608 [1] $ 7,100,512 [2]
Seasons San Juan Capistrano [Member] | Series A [Member] | San Juan Capistrano California    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2016 [1] 2016 [2]
Maturity Date Jan. 01, 2034 [1] Jan. 01, 2034 [2]
Base Interest Rate 5.00% [1] 5.00% [2]
Principal Outstanding $ 11,833,880 [1] $ 11,954,944 [2]
Silver Moon [Member] | Series A [Member] | Albuquerque, NM [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 [7] 2015 [8]
Maturity Date Aug. 01, 2055 [7] Aug. 01, 2055 [8]
Base Interest Rate 6.00% [7] 6.00% [8]
Principal Outstanding $ 7,480,455 [7] $ 7,557,312 [8]
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 $ 2,611,955 $ 2,631,168
Southpark [Member] | Austin,TX [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2009 2009 [9]
Maturity Date Dec. 01, 2049 Dec. 01, 2049 [9]
Base Interest Rate 6.13% 6.13% [9]
Principal Outstanding $ 12,300,000 $ 12,495,000 [9]
Summerhill [Member] | Series A [Member] | Bakersfield, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2016 [1] 2016 [2]
Maturity Date Dec. 01, 2033 [1] Dec. 01, 2033 [2]
Base Interest Rate 5.00% [1] 5.00% [2]
Principal Outstanding $ 6,136,763 [1] $ 6,199,861 [2]
Sycamore Walk [Member] | Series A [Member] | Bakersfield, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 [1] 2015 [2]
Maturity Date Jan. 01, 2033 [1] Jan. 01, 2033 [2]
Base Interest Rate 5.25% [1] 5.25% [2]
Principal Outstanding $ 3,380,901 [1] $ 3,428,986 [2]
The Palms at Premier Park Apartments | Columbia South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2013 [4] 2013 [5]
Maturity Date Jan. 01, 2050 [4] Jan. 01, 2050 [5]
Base Interest Rate 6.25% [4] 6.25% [5]
Principal Outstanding $ 17,872,527 [4] $ 18,137,042 [5]
Tyler Park Townhomes [Member] | Greenfield California    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2013 [4] 2013 [5]
Maturity Date Jan. 01, 2030 [4] Jan. 01, 2030 [5]
Base Interest Rate 5.75% [4] 5.75% [5]
Principal Outstanding $ 5,533,307 [4] $ 5,616,043 [5]
Village at Avalon [Member] | Albuquerque, NM [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2018 [12] 2018 [13]
Maturity Date Jan. 01, 2059 [12] Jan. 01, 2059 [13]
Base Interest Rate 5.80% [12] 5.80% [13]
Principal Outstanding $ 15,808,184 [12] $ 15,942,559 [13]
Village at Hanford Square [Member] | Series H [Member] | Hanford, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [3] 2023  
Maturity Date [3] May 01, 2030  
Base Interest Rate [3] 6.65%  
Principal Outstanding [3] $ 10,400,000  
Village Point Apartments [Member] | Monroe, NJ [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired [10] 2023  
Maturity Date [10] Jun. 01, 2030  
Base Interest Rate [10] 6.875%  
Principal Outstanding [10] $ 23,000,000  
The Village at Madera [Member] | Series A [Member] | Madera, California [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2016 [1] 2016 [2]
Maturity Date Dec. 01, 2033 [1] Dec. 01, 2033 [2]
Base Interest Rate 5.00% [1] 5.00% [2]
Principal Outstanding $ 2,947,519 [1] $ 2,977,825 [2]
Village at River's Edge [Member] | Columbia South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [1] 2017 [2]
Maturity Date Jun. 01, 2033 [1] Jun. 01, 2033 [2]
Base Interest Rate 6.00% [1] 6.00% [2]
Principal Outstanding $ 9,566,110 [1] $ 9,649,659 [2]
Vineyard Gardens | Series A [Member] | Oxnard, CA [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2017 [3] 2017 [6]
Maturity Date Jan. 01, 2035 [3] Jan. 01, 2035 [6]
Base Interest Rate 5.50% [3] 5.50% [6]
Principal Outstanding $ 3,874,962 [3] $ 3,908,104 [6]
Westside Village Market [Member] | Shafter California    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2013 [4] 2013 [5]
Maturity Date Jan. 01, 2030 [4] Jan. 01, 2030 [5]
Base Interest Rate 5.75% [4] 5.75% [5]
Principal Outstanding $ 3,616,007 [4] $ 3,670,075 [5]
Willow Run [Member] | Columbia South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2015 [1] 2015 [2]
Maturity Date Dec. 01, 2050 [1] Dec. 01, 2050 [2]
Base Interest Rate 5.50% [1] 5.50% [2]
Principal Outstanding $ 12,111,000 [1] $ 12,282,000 [2]
Windsor Shores Apartments [Member] | Columbia South Carolina    
Summary Of Investment Holdings [Line Items]    
Year Acquired [3] 2023  
Maturity Date [3] Feb. 01, 2030  
Base Interest Rate [3] 6.50%  
Principal Outstanding [3] $ 21,545,000  
Copper Gate Apartments [Member] | Lafayette, Indiana [Member]    
Summary Of Investment Holdings [Line Items]    
Year Acquired 2013 [4] 2013 [5]
Maturity Date Dec. 01, 2029 [4] Dec. 01, 2029 [5]
Base Interest Rate 6.25% [4] 6.25% [5]
Principal Outstanding $ 4,780,000 [4] $ 4,840,000 [5]
[1] MRB owned by ATAX TEBS IV, LLC (M45 TEBS), Note 16
[2] MRB owned by ATAX TEBS IV, LLC (M45 TEBS), Note 16
[3] MRB held by Mizuho Capital Markets, LLC in a secured financing transaction, Note 16
[4] MRB owned by ATAX TEBS II, LLC (M31 TEBS), Note 16
[5] MRB owned by ATAX TEBS II, LLC (M31 TEBS), 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 III, LLC (M33 TEBS), Note 16
[9] MRB owned by ATAX TEBS I, LLC (M24 TEBS), Note 16
[10] MRB held by Barclays Capital Inc. in a secured financing transaction, Note 16
[11] MRB held by Barclays Capital Inc. in a secured financing transaction, Note 16
[12] MRB held by Morgan Stanley in a secured financing transaction, Note 16
[13] MRB held by Morgan Stanley in a debt financing transaction, Note 16