Property Loans, Net of Loan Loss Allowances Narrative Tagging (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Property Loan Net Of Loan Loss Allowances [Line Items]
Property loan receivable, net	$ 31,603,970	$ 29,763,334
Cross Creek [Member]
Property Loan Net Of Loan Loss Allowances [Line Items]
Property loan receivable, net			$ 6,000
Foundation for Affordable Housing [Member]
Property Loan Net Of Loan Loss Allowances [Line Items]
Property loan receivable, net			2,500
Winston Group, Inc [Member]
Property Loan Net Of Loan Loss Allowances [Line Items]
Repayment of property loan, principal	500,000
Vantage at Brooks LLC [Member]
Property Loan Net Of Loan Loss Allowances [Line Items]
Property loan receivable, net	1,200,000		3,700,000
Vantage at Braunfels LLC [Member]
Property Loan Net Of Loan Loss Allowances [Line Items]
Property loan receivable, net	$ 1,100,000		$ 2,100,000