Property Loan, Net of Loan Loss Allowances Loan Loss Reserves (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]
Balance, beginning of year	$ 7,098,814	$ 7,098,814	$ 7,023,814
Provision for loan loss	0	0	75,000
Balance, end of year	$ 7,098,814	$ 7,098,814	$ 7,098,814