Investments in Bonds (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2010	Mar. 31, 2014	Jun. 30, 2014	Sep. 30, 2014	Mar. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	$ 338,861,752		$ 219,511,490
Cost adjusted for pay-downs	65,538,068		71,040,881
Unrealized Gain, held in trust	39,561,340		5,309,545
Unrealized Gain	5,082,559		340,453
Unrealized Loss, held in trust	0		(8,449,234)
Unrealized Loss	19,582		(2,434,964)
Estimated Fair Value, held in trust	378,423,092		216,371,801
Estimated Fair Value	70,601,045		68,946,370
Arbors at Hickory Ridge [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	11,570,933	[1]	11,576,209	[2]
Unrealized Gain, held in trust	1,792,303	[1]	225,690	[2]
Unrealized Loss, held in trust	0	[1]	0	[2]
Estimated Fair Value, held in trust	13,363,236	[1]	11,801,899	[2]
Ashley Square [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	5,159,000	[3]	5,212,000	[3]
Unrealized Gain, held in trust	486,559	[3]	0	[3]
Unrealized Loss, held in trust	0	[3]	0	[3]
Estimated Fair Value, held in trust	5,645,559	[3]	5,212,000	[3]
Autumn Pines [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			12,147,873	[2]
Unrealized Gain, held in trust			0	[2]
Unrealized Loss, held in trust			(195,355)	[2]
Estimated Fair Value, held in trust			11,952,518	[2]
Avistar at the Oaks [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			8,354,000	[2]
Unrealized Gain, held in trust			0	[2]
Unrealized Loss, held in trust			(1,103,115)	[2]
Estimated Fair Value, held in trust			7,250,885	[2]
Avistar in 09 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			7,192,000	[2]
Unrealized Gain, held in trust			0	[2]
Unrealized Loss, held in trust			(588,254)	[2]
Estimated Fair Value, held in trust			6,603,746	[2]
Avistar on the Hills [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			5,389,000	[2]
Unrealized Gain, held in trust			0	[2]
Unrealized Loss, held in trust			(417,724)	[2]
Estimated Fair Value, held in trust			4,971,276	[2]
Bella Vista [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	6,490,000	[3]	6,545,000	[3]
Unrealized Gain, held in trust	625,571	[3]	0	[3]
Unrealized Loss, held in trust	0	[3]	(473,989)	[3]
Estimated Fair Value, held in trust	7,115,571	[3]	6,071,011	[3]
Bridle Ridge [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	7,655,000	[3]	7,715,000	[3]
Unrealized Gain, held in trust	659,249	[3]	0	[3]
Unrealized Loss, held in trust	0	[3]	(452,870)	[3]
Estimated Fair Value, held in trust	8,314,249	[3]	7,262,130	[3]
Brookstone [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	7,468,888	[3]	7,463,641	[3]
Unrealized Gain, held in trust	1,360,589	[3]	841,751	[3]
Unrealized Loss, held in trust	0	[3]	0	[3]
Estimated Fair Value, held in trust	8,829,477	[3]	8,305,392	[3]
Copper Gate [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	5,220,000	[1]
Cost adjusted for pay-downs			5,220,000
Unrealized Gain, held in trust	563,656	[1]
Unrealized Gain			0
Unrealized Loss, held in trust	0	[1]
Unrealized Loss			(252,648)
Estimated Fair Value, held in trust	5,783,656	[1]
Estimated Fair Value			4,967,352
Cross Creek [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	6,074,817	[3]	6,042,297	[3]
Unrealized Gain, held in trust	2,542,262	[3]	1,480,266	[3]
Unrealized Loss, held in trust	0	[3]	0	[3]
Estimated Fair Value, held in trust	8,617,079	[3]	7,522,563	[3]
Lake Forest [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	8,886,000	[3]	8,997,000	[3]
Unrealized Gain, held in trust	1,003,614	[3]	0	[3]
Unrealized Loss, held in trust	0	[3]	(289,461)	[3]
Estimated Fair Value, held in trust	9,889,614	[3]	8,707,539	[3]
Runnymede [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	10,440,000	[3]	10,525,000	[3]
Unrealized Gain, held in trust	1,385,910	[3]	0	[3]
Unrealized Loss, held in trust	0	[3]	(551,510)	[3]
Estimated Fair Value, held in trust	11,825,910	[3]	9,973,490	[3]
Southpark [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	11,842,206	[3]	11,878,885	[2]
Unrealized Gain, held in trust	3,743,692	[3]	1,018,750	[3]
Unrealized Loss, held in trust	0	[3]	0	[3]
Estimated Fair Value, held in trust	15,585,898	[3]	12,897,635	[3]
The Palms at Premier Park [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	20,152,000	[1]
Cost adjusted for pay-downs			20,152,000
Unrealized Gain, held in trust	2,680,619	[1]
Unrealized Gain			0
Unrealized Loss, held in trust	0	[1]
Unrealized Loss			(283,942)
Estimated Fair Value, held in trust	22,832,619	[1]
Estimated Fair Value			19,868,058
The Suites on Paseo [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	35,450,000	[2]	35,750,000	[2]
Unrealized Gain, held in trust	3,193,691	[2]	0	[2]
Unrealized Loss, held in trust	0	[2]	(2,502)	[2]
Estimated Fair Value, held in trust	38,643,691	[2]	35,747,498	[2]
Tyler Park Apartments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs			8,100,000
Unrealized Gain			0
Unrealized Loss			(526,601)
Estimated Fair Value			7,573,399
Vantage at Harlingen [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	6,692,000		6,692,000
Unrealized Gain	707,813		0
Unrealized Loss	0		(211,735)
Estimated Fair Value	7,399,813		6,480,265
Vantage at Judson [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	6,049,000		6,049,000
Unrealized Gain	717,230		0
Unrealized Loss	0		(190,423)
Estimated Fair Value	6,766,230		5,858,577
Lost Creek [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust			15,883,084	[3]	15,900,000
Unrealized Gain, held in trust			1,743,088	[3]
Unrealized Loss, held in trust			0	[3]
Estimated Fair Value, held in trust			17,626,172	[3]	18,500,000
Westside Village Market [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs			5,400,000
Unrealized Gain			0
Unrealized Loss			(403,400)
Estimated Fair Value			4,996,600
Woodlynn Village [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	4,390,000	[3]	4,426,000	[3]
Unrealized Gain, held in trust	376,706	[3]	0	[3]
Unrealized Loss, held in trust	0	[3]	(340,979)	[3]
Estimated Fair Value, held in trust	4,766,706	[3]	4,085,021	[3]
Glenview Apts [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	6,723,000
Unrealized Gain	0
Unrealized Loss	0
Estimated Fair Value	6,723,000
Heritage Square [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	11,705,000
Unrealized Gain	1,109,125
Unrealized Loss	0
Estimated Fair Value	12,814,125
Montclair Apts [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	3,458,000
Unrealized Gain	0
Unrealized Loss	0
Estimated Fair Value	3,458,000
Renaissance Gateway [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	12,675,000		7,975,000
Unrealized Gain	1,055,807		0
Unrealized Loss	0		(16,964)
Estimated Fair Value	13,730,807		7,958,036
Santa Fe Apts [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	4,736,000
Unrealized Gain	0
Unrealized Loss	0
Estimated Fair Value	4,736,000
Bruton Apts [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	18,145,000	[2]
Unrealized Gain, held in trust	1,455,955	[2]
Unrealized Loss, held in trust	0	[2]
Estimated Fair Value, held in trust	19,600,955	[2]
Decatur-Angle [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	23,000,000	[2]
Unrealized Gain, held in trust	919,540	[2]
Unrealized Loss, held in trust	0	[2]
Estimated Fair Value, held in trust	23,919,540	[2]
Estimated Fair Value						23,000,000
Live 929 Apartments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	40,895,739	[2]
Unrealized Gain, held in trust	3,797,745	[2]
Unrealized Loss, held in trust	0	[2]
Estimated Fair Value, held in trust	44,693,484	[2]
Estimated Fair Value							40,300,000
Pro Nova [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	20,095,169	[2]
Unrealized Gain, held in trust	1,043,431	[2]
Unrealized Loss, held in trust	0	[2]
Estimated Fair Value, held in trust	21,138,600	[2]
Series B [Member] | Avistar at Chase Hill [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	965,000		2,005,000
Unrealized Gain	144,769		0
Unrealized Loss	0		(159,117)
Estimated Fair Value	1,109,769		1,845,883					1,000,000	2,000,000
Series B [Member] | Avistar at the Crest [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	759,000		1,700,000
Unrealized Gain	124,286		0
Unrealized Loss	0		(134,912)
Estimated Fair Value	883,286		1,565,088					800,000	1,700,000
Series B [Member] | Avistar at the Oaks [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	554,000
Unrealized Gain	54,325
Unrealized Loss	0
Estimated Fair Value	608,325						600,000
Series B [Member] | Avistar in 09 [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	457,000
Unrealized Gain	50,608
Unrealized Loss	0
Estimated Fair Value	507,608						500,000
Series B [Member] | Avistar on the Boulevard [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	451,000		3,216,000
Unrealized Gain	73,851		0
Unrealized Loss	0		(255,222)
Estimated Fair Value	524,851		2,960,778					500,000	3,200,000
Series B [Member] | Greens of Pine Glen [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	945,638		948,291
Unrealized Gain	376,203		189,589
Unrealized Loss	0		0
Estimated Fair Value	1,321,841		1,137,880
Series B [Member] | Ohio Properties [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	3,573,430		3,583,590
Unrealized Gain	668,542		150,864
Unrealized Loss	0		0
Estimated Fair Value	4,241,972		3,734,454
Series B [Member] | Tyler Park Apartments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	2,025,000
Unrealized Gain	0
Unrealized Loss	17,395
Estimated Fair Value	2,007,605		2,000,000
Series B [Member] | Westside Village Market [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	1,430,000
Unrealized Gain	0
Unrealized Loss	686
Estimated Fair Value	1,429,314		1,400,000
Series B [Member] | Glenview Apts [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	2,000,000
Series B [Member] | Harden Ranch [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost adjusted for pay-downs	2,340,000
Unrealized Gain	0
Unrealized Loss	1,501
Estimated Fair Value	2,338,499					2,300,000
Series B [Member] | Heritage Square [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value								500,000
Series B [Member] | Montclair Apts [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	1,000,000
Series B [Member] | Santa Fe Apts [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	1,700,000
Series A [Member] | Avistar at Chase Hill [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	10,000,000	[1]	8,960,000	[2]
Unrealized Gain, held in trust	1,196,800	[1]	0	[2]
Unrealized Loss, held in trust	0	[1]	(850,752)	[2]
Estimated Fair Value, held in trust	11,196,800	[1]	8,109,248	[2]
Estimated Fair Value								10,000,000	9,000,000
Series A [Member] | Avistar at the Crest [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	9,700,000	[1]	8,759,000	[2]
Unrealized Gain, held in trust	1,419,692	[1]	0	[2]
Unrealized Loss, held in trust	0	[1]	(1,298,785)	[2]
Estimated Fair Value, held in trust	11,119,692	[1]	7,460,215	[2]
Estimated Fair Value								9,700,000	8,800,000
Series A [Member] | Avistar at the Oaks [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	7,800,000	[1]
Unrealized Gain, held in trust	869,622	[1]
Unrealized Loss, held in trust	0	[1]
Estimated Fair Value, held in trust	8,669,622	[1]
Estimated Fair Value							7,800,000
Series A [Member] | Avistar in 09 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	6,735,000	[1]
Unrealized Gain, held in trust	750,885	[1]
Unrealized Loss, held in trust	0	[1]
Estimated Fair Value, held in trust	7,485,885	[1]
Estimated Fair Value							6,700,000
Series A [Member] | Avistar on the Boulevard [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	16,525,000	[1]	13,760,000	[2]
Unrealized Gain, held in trust	2,418,599	[1]	0	[2]
Unrealized Loss, held in trust	0	[1]	(1,306,512)	[2]
Estimated Fair Value, held in trust	18,943,599	[1]	12,453,488	[2]
Estimated Fair Value								16,500,000	13,800,000
Series A [Member] | Avistar on the Hills [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	5,389,000	[1]
Unrealized Gain, held in trust	743,520	[1]
Unrealized Loss, held in trust	0	[1]
Estimated Fair Value, held in trust	6,132,520	[1]
Estimated Fair Value							5,400,000
Series A [Member] | Greens of Pine Glen [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	8,366,000	[1]	8,437,501	[2]
Unrealized Gain, held in trust	1,005,119	[1]	0	[2]
Unrealized Loss, held in trust	0	[1]	(577,426)	[2]
Estimated Fair Value, held in trust	9,371,119	[1]	7,860,075	[2]
Series A [Member] | Ohio Properties [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	14,407,000	[3]	14,498,000	[3]
Unrealized Gain, held in trust	2,444,034	[3]	0	[3]
Unrealized Loss, held in trust	0	[3]	0	[3]
Estimated Fair Value, held in trust	16,851,034	[3]	14,498,000	[3]
Series A [Member] | Tyler Park Apartments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	6,075,000	[1]
Unrealized Gain, held in trust	345,060	[1]
Unrealized Loss, held in trust	0	[1]
Estimated Fair Value, held in trust	6,420,060	[1]
Estimated Fair Value			6,100,000
Series A [Member] | Westside Village Market [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	3,970,000	[1]
Unrealized Gain, held in trust	225,496	[1]
Unrealized Loss, held in trust	0	[1]
Estimated Fair Value, held in trust	4,195,496	[1]
Estimated Fair Value			4,000,000
Series A [Member] | Glenview Apts [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	4,700,000
Series A [Member] | Harden Ranch [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	6,960,000	[1]
Unrealized Gain, held in trust	511,421	[1]
Unrealized Loss, held in trust	0	[1]
Estimated Fair Value, held in trust	7,471,421	[1]
Estimated Fair Value						7,000,000
Series A [Member] | Heritage Square [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value								11,200,000
Series A [Member] | Montclair Apts [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	2,500,000
Series A [Member] | Santa Fe Apts [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 3,000,000

[1] (3) Bonds owned by ATAX TEBS II, LLC, Note 11

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

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