Investments in Tax-Exempt Bonds Investments in Tax-Exempt Bonds Ohio (Details) (USD $)		6 Months Ended		24 Months Ended		24 Months Ended
Feb. 28, 2013 properties	Jun. 30, 2010 Consolidated Properties [Member] Ohio Properties [Member] Segment, Discontinued Operations [Member] properties	Dec. 31, 2011 Consolidated Properties [Member] Ohio Properties [Member] Segment, Discontinued Operations [Member] properties	Jun. 30, 2012 Consolidated Properties [Member] Series A [Member] Ohio Properties [Member] Segment, Discontinued Operations [Member]	Jun. 30, 2010 Consolidated Properties [Member] Series A [Member] Ohio Properties [Member] Segment, Discontinued Operations [Member]	Jun. 30, 2012 Consolidated Properties [Member] Series B [Member] Ohio Properties [Member] Segment, Discontinued Operations [Member]	Jun. 30, 2010 Consolidated Properties [Member] Series B [Member] Ohio Properties [Member] Segment, Discontinued Operations [Member]
Available-for-sale Securities		$ 18,300,000			$ 14,700,000		$ 3,600,000
percent of return, securities, available for sale				7.00%		10.00%
Available-for-sale Security, Maturity Date at a point in time		Jun. 01, 2050
Number of Real Estate Properties	3	3	3

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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