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Investments in Tax-Exempt Bonds Investments of Tax-Exempt Bonds Clarkson College (Details) (USD $)
12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Dec. 31, 2011
Briarwood Manor [Member]
Dec. 31, 2011
Clarkson College [Member]
Jun. 30, 2011
Clarkson College [Member]
Dec. 31, 2011
Principal Balance [Member]
Clarkson College [Member]
Dec. 31, 2011
Financing Receivable [Member]
Clarkson College [Member]
Dec. 31, 2011
Contingent Interest [Member]
Clarkson College [Member]
Available-for-sale Securities, Fair Value Disclosure $ 45,703,294 $ 26,542,565   $ 45,703,294     $ 5,100,000      
Proceeds from Sale of Available-for-sale Securities $ 31,872,522 $ 0 $ 0   $ 4,900,000 $ 6,100,000   $ 5,800,000 $ 0 $ 308,000