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Investments in Tax-Exempt Bonds Avistar Portfolio (Details) (USD $)
9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Mar. 31, 2013
Avistar on the Boulevard [Member]
Unit
Mar. 31, 2013
Avistar at Chase Hill [Member]
Unit
Mar. 31, 2013
Avistar at the Crest [Member]
Unit
Mar. 31, 2013
Series A [Member]
Avistar on the Boulevard [Member]
Mar. 31, 2013
Series A [Member]
Avistar at Chase Hill [Member]
Mar. 31, 2013
Series A [Member]
Avistar at the Crest [Member]
Sep. 30, 2013
Series A [Member]
Avistar Portfolio [Member]
Mar. 31, 2013
Series A [Member]
Avistar Portfolio [Member]
Sep. 30, 2013
Series B [Member]
Avistar on the Boulevard [Member]
Mar. 31, 2013
Series B [Member]
Avistar on the Boulevard [Member]
Sep. 30, 2013
Series B [Member]
Avistar at Chase Hill [Member]
Mar. 31, 2013
Series B [Member]
Avistar at Chase Hill [Member]
Sep. 30, 2013
Series B [Member]
Avistar at the Crest [Member]
Mar. 31, 2013
Series B [Member]
Avistar at the Crest [Member]
Sep. 30, 2013
Series B [Member]
Avistar Portfolio [Member]
Mar. 31, 2013
Series B [Member]
Avistar Portfolio [Member]
Sep. 30, 2013
Series C [Member]
Avistar Portfolio [Member]
Mar. 31, 2013
Series C [Member]
Avistar Portfolio [Member]
Schedule of Available-for-sale Securities [Line Items]                                        
Tax-exempt mortgage revenue bonds, at fair value $ 48,161,743 $ 45,703,294       $ 13,800,000 $ 9,000,000 $ 8,800,000     $ 2,961,454 $ 3,200,000 $ 1,846,304 $ 2,000,000 $ 1,565,445 $ 1,700,000        
Number of Units in Real Estate Property     344 232 200                              
Debt Instrument, Interest Rate, Stated Percentage                   6.00%               9.00% 9.00% 9.00%
Available-for-sale Security, Maturity Date at a point in time                 Mar. 01, 2050               Apr. 01, 2050   Apr. 01, 2050  
Available-for-sale Securities, at Par Value                                     $ 804,000 $ 804,000