Investments in Tax-Exempt Bonds Arbors of Hickory Ridge Purchase (Details) (USD $)	3 Months Ended		6 Months Ended	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Jun. 30, 2012 Arbors at Hickory Ridge [Member] Unit	Dec. 31, 2012 Arbors at Hickory Ridge [Member]	Mar. 31, 2013 Arbors at Hickory Ridge [Member]
Available-for-sale Securities, Fair Value Disclosure				$ 10,000,000	$ 11,500,000
Number of Units in Real Estate Property				348
Available-for-Sale Securities, Asset Ownership				100.00%	100.00%
Property loans receivable	22,979,599		20,328,927		191,264	191,264
Payments to Acquire Available-for-sale Securities	$ 38,400,000	$ 0		$ 10,200,000	$ 1,041,000
Debt Instrument, Interest Rate, Stated Percentage					6.25%
Available-for-sale Security, Maturity Date at a point in time					Dec. 01, 2049

The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

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+ Details