Investments in Mortgage Revenue Bonds Investment in Bonds Narrative Tagging (Details) (USD $)	12 Months Ended							12 Months Ended											12 Months Ended			3 Months Ended	12 Months Ended						12 Months Ended					12 Months Ended			6 Months Ended	12 Months Ended				3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	6 Months Ended			12 Months Ended											3 Months Ended	12 Months Ended		12 Months Ended			12 Months Ended			12 Months Ended			3 Months Ended	12 Months Ended			12 Months Ended							3 Months Ended	12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		3 Months Ended	12 Months Ended				3 Months Ended		9 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended		12 Months Ended
	Dec. 31, 2013 properties entities	Dec. 31, 2012 properties	Dec. 31, 2011	Dec. 31, 2013 Effective rate - minimum [Member]	Dec. 31, 2013 Effective rate - maximum [Member]	Dec. 31, 2013 10% adverse [Member] Effective rate - minimum [Member]	Dec. 31, 2013 10% adverse [Member] Effective rate - maximum [Member]	Dec. 31, 2013 Available-for-sale Securities [Member]	Dec. 31, 2013 Available-for-sale Securities [Member] 10% adverse [Member]	Dec. 31, 2013 Copper Gate [Member] Unit	Dec. 31, 2013 Tyler Park Apartments [Member] Unit	Dec. 31, 2013 Westside Village Market [Member] Unit	Dec. 31, 2013 The Palms at Premier Park [Member] Unit	Dec. 31, 2013 The Suites on Paseo [Member] Unit		Dec. 31, 2013 Vantage at Harlingen [Member] Unit	Dec. 31, 2013 Ohio Properties [Member]	Mar. 31, 2013 Ohio Properties [Member]	Dec. 31, 2013 Greens of Pine Glen [Member]	Dec. 31, 2012 Greens of Pine Glen [Member]	Sep. 30, 2013 Greens of Pine Glen [Member]	Sep. 30, 2013 Iona Lakes [Member]	Dec. 31, 2013 Iona Lakes [Member]	Dec. 31, 2012 Iona Lakes [Member]		Jun. 30, 2013 Dublin [Member] Unit	Jun. 30, 2013 Kingswood [Member] [Member] Unit	Jun. 30, 2013 Waterford [Member] Unit	Dec. 31, 2013 Rennaisance [Member]	Jun. 30, 2013 Rennaisance [Member] Unit	Mar. 31, 2013 Avistar on the Boulevard [Member] Unit	Mar. 31, 2013 Avistar at Chase Hill [Member] Unit	Mar. 31, 2013 Avistar at the Crest [Member] Unit	Dec. 31, 2013 Vantage at Judson [Member]	Dec. 31, 2012 Vantage at Judson [Member] Unit		Jun. 30, 2012 Arbors at Hickory Ridge [Member] Unit	Dec. 31, 2013 Arbors at Hickory Ridge [Member]		Dec. 31, 2012 Arbors at Hickory Ridge [Member]		Jun. 30, 2012 GMF-Madison Tower [Member]	Dec. 31, 2013 GMF-Madison Tower [Member]	Jun. 30, 2012 GMF-Warren/Tulane [Member]	Dec. 31, 2013 GMF-Warren/Tulane [Member]	Jun. 30, 2011 TN Bonds [Member]	Dec. 31, 2013 TN Bonds [Member]	Jun. 30, 2012 TN Bonds [Member]	Dec. 31, 2013 Minimum [Member] Vantage at Judson and Woodlynn Village [Member]	Dec. 31, 2013 Series A [Member] Tyler Park Apartments [Member]	Dec. 31, 2013 Series A [Member] Westside Village Market [Member]	Dec. 31, 2013 Series A [Member] Ohio Properties [Member]		Dec. 31, 2013 Series A [Member] Greens of Pine Glen [Member]		Dec. 31, 2012 Series A [Member] Greens of Pine Glen [Member]	Jun. 30, 2013 Series A [Member] Dublin [Member]	Jun. 30, 2013 Series A [Member] Kingswood [Member] [Member]	Jun. 30, 2013 Series A [Member] Waterford [Member]	Jun. 30, 2013 Series A [Member] Dublin, Kingswood and Waterford [Member]	Dec. 31, 2013 Series A [Member] Rennaisance [Member]	Jun. 30, 2013 Series A [Member] Rennaisance [Member]	Dec. 31, 2013 Series A [Member] Avistar on the Boulevard [Member]		Mar. 31, 2013 Series A [Member] Avistar on the Boulevard [Member]	Dec. 31, 2013 Series A [Member] Avistar at Chase Hill [Member]		Mar. 31, 2013 Series A [Member] Avistar at Chase Hill [Member]	Dec. 31, 2013 Series A [Member] Avistar at the Crest [Member]		Mar. 31, 2013 Series A [Member] Avistar at the Crest [Member]	Mar. 31, 2013 Series A [Member] Avistar Portfolio [Member]	Dec. 31, 2013 Series B [Member] Tyler Park Apartments [Member]	Dec. 31, 2013 Series B [Member] Westside Village Market [Member]	Dec. 31, 2013 Series B [Member] Vantage at Harlingen [Member]	Dec. 31, 2013 Series B [Member] Ohio Properties [Member]	Dec. 31, 2013 Series B [Member] Greens of Pine Glen [Member]		Dec. 31, 2012 Series B [Member] Greens of Pine Glen [Member]	Jun. 30, 2013 Series B [Member] Dublin [Member]	Jun. 30, 2013 Series B [Member] Kingswood [Member] [Member]	Jun. 30, 2013 Series B [Member] Waterford [Member]	Jun. 30, 2013 Series B [Member] Dublin, Kingswood and Waterford [Member]	Dec. 31, 2013 Series B [Member] Rennaisance [Member]	Jun. 30, 2013 Series B [Member] Rennaisance [Member]	Dec. 31, 2013 Series B [Member] Avistar on the Boulevard [Member]	Mar. 31, 2013 Series B [Member] Avistar on the Boulevard [Member]	Dec. 31, 2013 Series B [Member] Avistar at Chase Hill [Member]	Mar. 31, 2013 Series B [Member] Avistar at Chase Hill [Member]	Dec. 31, 2013 Series B [Member] Avistar at the Crest [Member]	Mar. 31, 2013 Series B [Member] Avistar at the Crest [Member]	Mar. 31, 2013 Series B [Member] Avistar Portfolio [Member]	Dec. 31, 2013 Series B [Member] Avistar Portfolio [Member]	Dec. 31, 2013 Series B [Member] Vantage at Judson [Member]	Dec. 31, 2013 Series B [Member] Minimum [Member] Vantage at Harlingen [Member]	Dec. 31, 2013 Series B [Member] Maximum [Member] Vantage at Harlingen [Member]	Jun. 30, 2013 Series A and B [Member] Rennaisance [Member]	Dec. 31, 2013 Series C [Member] Vantage at Harlingen [Member]	Sep. 30, 2013 Series C [Member] Dublin, Kingswood and Waterford [Member]	Jun. 30, 2013 Series C [Member] Dublin, Kingswood and Waterford [Member]	Jun. 30, 2013 Series C [Member] Rennaisance [Member]	Dec. 31, 2013 Series C [Member] Rennaisance [Member]	Mar. 31, 2013 Series C [Member] Avistar Portfolio [Member]	Dec. 31, 2013 Series C [Member] Avistar Portfolio [Member]	Dec. 31, 2012 Series C [Member] Vantage at Judson [Member]	Dec. 31, 2013 Series D [Member] Vantage at Harlingen [Member]	Dec. 31, 2012 Series D [Member] Vantage at Judson [Member]	Dec. 31, 2013 San Antonio, Texas [Member]	Dec. 31, 2012 San Antonio, Texas [Member]	Dec. 31, 2013 San Diego, California [Member]
Number of Units in Real Estate Property										128	88	81	240	384		288										156	129	133		208	344	232	200		288		348
Available-for-sale Security, Maturity Date at a point in time										Dec. 01, 2029			Jan. 01, 2050	Dec. 01, 2048	[1]	Oct. 01, 2053			Oct. 01, 2047	Oct. 01, 2047				Apr. 01, 2030	[1]									Feb. 01, 2053	Feb. 01, 2053	[2]	Apr. 01, 2026	Dec. 01, 2049	[1]	Dec. 01, 2049	[2]		Dec. 01, 2019		Dec. 01, 2015					Jan. 01, 2030	Jan. 01, 2030	Jun. 01, 2050	[1]	Oct. 01, 2047	[1]					Aug. 01, 2050	Jun. 01, 2050		Mar. 01, 2050	[1]		Mar. 01, 2050	[1]		Mar. 01, 2050	[1]		Mar. 01, 2050	Jan. 01, 2016	Jan. 01, 2016		Jun. 01, 2050	Oct. 01, 2047	[1]					Sep. 01, 2050	Jun. 01, 2050								Apr. 01, 2050	Apr. 01, 2050				Jun. 01, 2030		Sep. 01, 2050		Jun. 01, 2015	Jun. 01, 2015	Apr. 01, 2050	Apr. 01, 2050		Oct. 01, 2053
Property loan receivable, gross	$ 21,549,927	$ 20,328,927															$ 2,361,447		$ 876,000					$ 7,741,118													$ 600,000	$ 191,264		$ 191,264
Undistributed Net Realized Gain (Loss) on Sale of Properties																																								557,000								668,000
Available-for-sale Security, Purchase Date																																														Jun. 01, 2011
Available-for-sale Securities, at Par Value	299,841,918	146,806,203								5,220,000			20,152,000	35,750,000	[1]	6,692,000			9,500,000					15,535,000	[1]									6,049,000	6,049,000	[2]	10,000,000	11,450,000	[1]	11,450,000	[2]									6,075,000	3,970,000	14,498,000	[1]	8,437,501	[1]	8,515,000					3,850,000		13,760,000	[1]		8,960,000	[1]		8,759,000	[1]			2,025,000	1,430,000		3,583,590	948,291	[1]	950,000					1,250,000									6,921,000	26,700,000	18,000,000	24,700,000		6,700,000		831,000	2,900,000	2,875,000	804,000	804,000	6,000,000	1,283,000	934,000
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	219,511,490	88,257,386												35,750,000	[1]																							11,576,209	[1]													14,498,000	[2]	8,437,501	[1]								13,760,000	[1]		8,960,000	[1]		8,759,000	[1]
Effective rate				6.30%	9.80%	6.90%	10.80%
Adverse change rate	10.00%
Number of Variable Interest Entities	4	5
Available-for-sale Securities, Gross Unrealized Loss	2,434,964	4,289,886							22,100,000	252,648	526,601	403,400	283,942			211,735								0					16,964					190,423	847					0																																				0	0									255,222		159,117		134,912
Unrealized Loss Position for Available-for-sale Securities																																																	12 months
Available-for-sale Securities, Amortized Cost Basis	71,040,881	48,827,485								5,220,000	8,100,000	5,400,000	20,152,000			6,692,000								15,535,000					7,975,000					6,049,000	6,049,000					11,581,485																																				3,583,590	948,291									3,216,000		2,005,000		1,700,000
Debt Instrument, Interest Rate, Stated Percentage								6.00%		6.25%			6.25%	6.25%	[1]	9.00%								6.90%	[1]									9.00%	9.00%	[2]	7.98%	6.25%	[1]	6.25%	[2]		0.00%		0.00%					5.75%	5.75%	7.00%	[1]	6.50%	[1]	6.50%				6.00%	6.00%	6.00%	6.00%	[1]		6.00%	[1]		6.00%	[1]		6.00%	5.50%	5.50%	6.00%	10.00%	12.00%	[1]	12.00%				9.00%	12.00%	12.00%							9.00%	9.00%	0.00%				9.00%		9.00%	12.00%	12.00%	9.00%	9.00%		9.00%	9.00%
Contingent Interest Percentage																																			3.00%
Available-for-sale Securities	68,946,370	45,703,294								4,967,352	7,573,399	4,996,600	19,868,058			6,480,265								16,089,910					7,958,036					5,858,577	6,048,153					12,192,270										6,100,000	4,000,000						5,900,000	3,100,000	5,500,000			8,600,000			13,800,000			9,000,000			8,800,000		2,000,000	1,400,000		3,734,454	1,137,880			2,500,000	2,300,000	1,700,000				2,960,778	3,200,000	1,845,883	2,000,000	1,565,088	17,000,000							6,700,000
Forward Bond Commitment, Gross Unrealized Loss								600,000								1,700,000													600,000					2,000,000
Limited Partners' Contributed Capital																	6,500,000	6,500,000		961,000	800,000
Proceeds from Sale of Available-for-sale Securities	21,935,343	31,872,522	11,067,524																			21,900,000	21,900,000																			4,100,000		12,700,000
Contingent Interest Income	6,497,160	0	309,990																			6,500,000	6,500,000
Mortgage Loans on Real Estate, Write-down or Reserve, Amt	(4,557,741)	0	0																			4,600,000	4,600,000
Available-for-Sale Securities, Asset Ownership																			100.00%	100.00%																	100.00%			100.00%
Payments to Acquire Available-for-sale Securities	148,624,000	28,561,857	20,917,500																																		10,200,000			1,000,000
Available-for-sale Securities, Debt Securities	$ 4,075,953	$ 1,524,873																																													$ 600,000
Percentage of Available for Sale Securities by Location																																																																																																												30.00%	17.00%	12.00%

[1] Bond held by Deutsche Bank in a secured financing transaction, Note 11

[2] Bonds owned by ATAX TEBS I, LLC, Note 11