Commitments and Contingencies Narrative Tagging (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) Unit	Dec. 31, 2015 USD ($) Unit	Dec. 31, 2014 USD ($)	Oct. 31, 2015 USD ($) Unit
Property loans receivable	$ 36,862,148	$ 29,874,523		$ 17,000,000
Number of units in real estate property | Unit				2
Concentration risk, credit risk, financial instrument, maximum exposure	500,300,000
Greens of Pine Glen [Member]
Property loans receivable	850,000	850,000
Guarantor obligations, maximum exposure, undiscounted	$ 2,800,000
Percentage of loss contingency, range of possible loss, maximum	75.00%
Ohio Properties [Member]
Property loans receivable	$ 2,390,446	$ 2,390,448
Percentage of loss contingency, range of possible loss, maximum	75.00%
Loss contingency, range of possible loss, maximum	$ 4,400,000
The 50/50 Student Housing--UNL [Member]
Number of units in real estate property | Unit	475	475
Initial lease term expiration period	2038-03
Lease agreement extend term	5 years
Annual lease payments	$ 100
Minimum monthly rentals under lease agreement	$ 122,000
Annual increment Percentage in lease rent	2.00%
Lease expiration date	Jul. 31, 2034
Lease agreement annual renewable increase percentage	3.00%
Expenses related to the agreement	$ 123,000	$ 120,000	$ 50,000
October 2015 Purchase Commitment [Member]
Remaining maximum amount committed	$ 3,400,000