Property Loans, Net of Loan Loss Allowances Loan Receivable and Allowance (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	$ 35,702,765	$ 29,874,523
Accrued Interest	2,309,311	10,185,405
Loan Loss Allowances	(7,098,814)	(7,098,814)
Interest Allowance	0	(8,718,387)
Net Taxable Property Loans	30,913,262	24,242,727
Arbors at Hickory Ridge [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	191,264	191,264
Accrued Interest	47,232	39,950
Loan Loss Allowances	0	0
Interest Allowance	0	0
Net Taxable Property Loans	238,496	231,214
Ashley Square [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	5,078,342	5,078,342
Accrued Interest	0	2,864,130
Loan Loss Allowances	(3,596,342)	(3,596,342)
Interest Allowance	0	(2,864,130)
Net Taxable Property Loans	1,482,000	1,482,000
Avistar (February 2013 Portfolio) [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	274,496	274,496
Accrued Interest	70,939	51,386
Loan Loss Allowances	0	0
Interest Allowance	0	0
Net Taxable Property Loans	345,435	325,882
Avistar (June 2013 Portfolio) [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	251,622	251,622
Accrued Interest	65,027	47,104
Loan Loss Allowances	0	0
Interest Allowance	0	0
Net Taxable Property Loans	316,649	298,726
Cross Creek [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	7,078,087	7,072,087
Accrued Interest	0	2,352,851
Loan Loss Allowances	(3,447,472)	(3,447,472)
Interest Allowance	0	(2,352,852)
Net Taxable Property Loans	3,630,615	3,624,614
Foundation for Affordable Housing [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	1,418,075	1,415,590
Accrued Interest	25,907	0
Loan Loss Allowances	0	0
Interest Allowance	0	0
Net Taxable Property Loans	1,443,982	1,415,590
Greens of Pine Glen [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	850,000	850,000
Accrued Interest	404,026	343,600
Loan Loss Allowances	0	0
Interest Allowance	0	0
Net Taxable Property Loans	1,254,026	1,193,600
Lake Forest [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	4,623,704	4,623,704
Accrued Interest	0	3,080,446
Loan Loss Allowances	(55,000)	(55,000)
Interest Allowance	0	(3,059,610)
Net Taxable Property Loans	4,568,704	4,589,540
Ohio Properties [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	2,390,446	2,390,448
Accrued Interest	904,650	1,235,017
Loan Loss Allowances	0	0
Interest Allowance	0	(441,795)
Net Taxable Property Loans	3,295,096	3,183,670
Vantage at Brooks LLC [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	7,199,424	3,454,664
Accrued Interest	394,201	78,440
Loan Loss Allowances	0	0
Interest Allowance	0	0
Net Taxable Property Loans	7,593,625	3,533,104
Vantage at Braunfels LLC [Member]
Accounts Notes And Loans Receivable [Line Items]
Property loan receivable, outstanding balance	6,347,305	4,272,306
Accrued Interest	397,329	92,481
Loan Loss Allowances	0	0
Interest Allowance	0	0
Net Taxable Property Loans	$ 6,744,634	$ 4,364,787