Subsequent Events Subsequent Events Footnote Tagging (Details) (USD $)	12 Months Ended				3 Months Ended		12 Months Ended					3 Months Ended				12 Months Ended	3 Months Ended			3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Mar. 31, 2014 Lost Creek [Member]		Dec. 31, 2012 Lost Creek [Member]		Dec. 31, 2013 Lost Creek [Member]		Mar. 31, 2014 Harden Ranch [Member] Unit	Mar. 31, 2014 Decatur-Angle [Member] Unit	Dec. 31, 2013 TEB Facility [Member]	Dec. 31, 2012 TEB Facility [Member]	Dec. 31, 2013 TEB Facility [Member] Lost Creek [Member]	Dec. 31, 2013 Series A [Member] Lost Creek [Member]	Mar. 31, 2014 Series A [Member] Harden Ranch [Member]	Mar. 31, 2014 Series B [Member] Harden Ranch [Member]	Mar. 31, 2015 Series B [Member] Harden Ranch [Member]	Mar. 31, 2014 SMBC Capital Markets, Inc [Member]
Subsequent Event [Line Items]
Proceeds from Sale of Available-for-sale Securities	$ 21,935,343	$ 31,872,522	$ 11,067,524		$ 18,700,000
Available-for-sale Securities, Amortized Cost Basis, Held in Trust	219,511,490	88,257,386			15,900,000	[1]	15,987,744	[1]	15,883,084	[1]
Available-for-sale Securities, Gross Realized Gain (Loss)	(651,849)				2,800,000
Special Distribution					25.00%
Debt financing	257,274,000	177,948,000											92,979,000	94,000,000	15,700,000
Available-for-sale Securities	68,946,370	45,703,294										23,000,000					7,000,000	2,300,000
Number of Units in Real Estate Property											100	302
Debt Instrument, Interest Rate, Stated Percentage							6.25%	[1]				5.75%	0.10%	0.13%		6.25%	5.75%	5.50%	8.00%
Available-for-sale Security, Maturity Date at a point in time							Jun. 01, 2041	[1]				Jan. 01, 2054				Jun. 01, 2041	Mar. 01, 2031	Mar. 01, 2016
Derivative Asset, Notional Amount																				70,000,000
Derivative, Fixed Interest Rate				3.00%																1.00%
Derivative, Maturity Date at a point in time																				Mar. 01, 2017
Deriviative at purchase price																				390,000
TOB Financing												$ 17,300,000

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