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Investments in Mortgage Revenue Bonds Investment in Bonds Narrative Tagging (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Proceeds from sale of mortgage revenue bond   $ 9,295,000   $ 31,791,699  
Debt financing   495,383,033 $ 451,496,716    
Estimated Fair Value, held in trust   $ 90,016,872 $ 47,366,656    
CALIFORNIA          
Percentage of Available for Sale Securities by Location   20.00% 8.00%    
San Antonio, Texas [Member]          
Percentage of Available for Sale Securities by Location   45.00% 51.00%    
South Carolina [Member]          
Percentage of Available for Sale Securities by Location   12.00% 12.00%    
Pro Nova 2014-1 [Member]          
Proceeds from sale of mortgage revenue bond $ 9,500,000        
Pro Nova 2014-1 [Member] | Term TOB Facility [Member]          
Debt financing $ 8,400,000        
The Suites on Paseo [Member] | Series A and B [Member]          
Estimated Fair Value, held in trust         $ 41,000,000
Series B [Member]          
Principal payments received on mortgage revenue bonds and PHCs   $ 5,200,000      
Proceeds from sale of mortgage revenue bond     $ 5,800,000    
Series B [Member] | Renaissance Gateway [Member]          
Cost adjusted for pay-downs     1,300,000    
Series C [Member] | Renaissance Gateway [Member]          
Cost adjusted for pay-downs     1,700,000    
Cash received for resizing of mortgage revenue bonds     1,200,000    
Series A [Member] | Renaissance Gateway [Member]          
Cost adjusted for pay-downs     $ 8,500,000