Discontined Operations Discontinued Operations Narrative (Details) (USD $)	12 Months Ended					9 Months Ended	3 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Available-for-sale Securities, at Par Value	$ 409,506,066		$ 299,841,918
Property, Plant and Equipment, Net	122,808,314		103,148,934
Property, Plant and Equipment, Gross	147,500,114		122,277,687
Interest Income, Operating	856,217		1,772,338		150,882
Other income	188,000		250,000		555,328
Eagle Ridge [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets of Disposal Group, Including Discontinued Operation					2,500,000
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Net of Tax					126,000
Greens of Pine Glen [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Limited Partners' Contributed Capital			800,000		961,000	800,000
Available-for-Sale Securities, Asset Ownership					100.00%
Available-for-sale Security, Maturity Date at a point in time					Oct. 01, 2047
Loans Payable					850,000
Assets of Disposal Group, Including Discontinued Operation	0
business disposal, sales price					7,300,000
Gain (Loss) on Sale of Properties						1,400,000
Investment Income, Interest			500,000
churchland [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
business disposal, sales price								8,100,000
Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Net of Tax								1,300,000
Ohio Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Limited Partners' Contributed Capital			6,500,000				6,500,000
Assets of Disposal Group, Including Discontinued Operation	0
Gain (Loss) on Sale of Properties							1,800,000
Investment Income, Interest							3,500,000
Interest Income, Operating							1,100,000
Other income							250,000
Boston Capital Limited Partners [Member] | Greens of Pine Glen [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Limited Partners					2
Series A [Member] | Greens of Pine Glen [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.50%	[1]	6.50%	[2]	6.50%
Available-for-sale Securities, at Par Value	8,366,000	[1]	8,437,501	[2]	8,515,000
Available-for-sale Security, Maturity Date at a point in time	Oct. 01, 2047	[1]	Oct. 01, 2047	[2]
Series A [Member] | Ohio Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.00%	[3]	7.00%	[2]
Available-for-sale Securities, at Par Value	14,407,000	[3]	14,498,000	[2]
Available-for-sale Security, Maturity Date at a point in time	Jun. 01, 2050	[3]	Jun. 01, 2050	[2]
Series B [Member] | Greens of Pine Glen [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.00%		12.00%	[2]	12.00%
Available-for-sale Securities, at Par Value	945,638		948,291	[2]	950,000
Available-for-sale Security, Maturity Date at a point in time	Oct. 01, 2047		Oct. 01, 2047	[2]
Series B [Member] | Ohio Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	10.00%		10.00%
Available-for-sale Securities, at Par Value	$ 3,573,430		$ 3,583,590
Available-for-sale Security, Maturity Date at a point in time	Jun. 01, 2050		Jun. 01, 2050

[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