Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Loans Payable and Secured Line of Credit (Details Textual)		1 Months Ended			9 Months Ended
	May 11, 2016 USD ($)	May 24, 2018 USD ($)	Dec. 22, 2017 USD ($) ft²	Feb. 22, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Aug. 04, 2017 USD ($)	Dec. 31, 2016 USD ($)	Feb. 09, 2015 USD ($)
Interest Costs Capitalized					$ 839,000
Long-term Line of Credit					0		$ 0
Line of Credit Facility, Expiration Date				Feb. 22, 2019
Loans Payable					113,998,000		36,167,000
Debt Instrument, Interest Rate Terms		bearing interest at a blended average rate of 3.72% over the 30-day LIBOR, each with a one year extension option upon satisfaction of certain conditions.
Debt Instrument, Payment Terms		a guaranty of 25% of the principal amount, decreasing to 10% of the principal balance upon the debt yield ratio becoming equal to or greater than 7.0%.
Cash and Cash Equivalents, at Carrying Value					$ 14,620,000	$ 34,876,000	15,273,000		$ 4,678,000
Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.00%		2.50%
Loans Payable [Member]
Debt Instrument, Interest Rate, Effective Percentage					5.98%
Debt Instrument, Face Amount		$ 67,800,000
Debt Instrument, Term		2 years
Landmarked Robert And Anne Dickey House [Member]
Area of Real Estate Property \| ft²			7,500
Sterling National Bank [Member]
Debt Instrument, Description of Variable Rate Basis				100
Debt Instrument, Interest Rate, Effective Percentage				3.75%
Line of Credit Facility, Maximum Borrowing Capacity				$ 12,000,000		11,000,000
Secured Debt								$ 2,900,000
Line of Credit Facility, Remaining Borrowing Capacity						9,100,000
Interest Rate Cap [Member]
Interest Expense, Debt					$ 3,000	$ 3,000
Interest Rate Cap [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivative Asset, Fair Value, Gross Asset							$ 344,000
Interest Rate Cap [Member] \| Sterling National Bank [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivative Asset, Fair Value, Gross Asset					$ 1,200,000
West Palm Beach Florida Loan [Member]
Debt Instrument, Interest Rate, Basis for Effective Rate	interest at 30-day LIBOR plus 230 basis points.
Debt Instrument, Interest Rate, Effective Percentage					4.56%		3.86%
Debt Instrument, Unamortized Premium	$ 14,000
Line of Credit Facility, Maximum Borrowing Capacity	12,600,000
Derivative, Notional Amount	9,100,000
West Palm Beach Florida Loan [Member] \| Interest Rate Cap [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivative Asset, Fair Value, Gross Asset					$ 2,000		$ 5,000
Greenwich Loan [Member]
Debt Instrument, Interest Rate, Effective Percentage										5.50%
Line of Credit Facility, Maximum Borrowing Capacity										$ 40,000,000
Greenwich Construction Loan [Member]
Debt Instrument, Unamortized Premium			$ 393,000
Derivative, Notional Amount			189,500,000
Debt Instrument, Face Amount			$ 189,500,000
Number of Real Estate Properties			90
Debt Instrument, Description			(i) LIBOR plus 8.25% and (ii) 9.25%. The effective interest rate on the 77 Greenwich Construction Facility was 10.51% as of September 30, 2018 and 9.81% at December 31, 2017.
Loans Payable					$ 42,800,000		$ 32,700,000
Cash and Cash Equivalents, at Carrying Value			$ 15,000,000
Greenwich Construction Loan [Member] \| Multi Use Building [Member]
Area of Real Estate Property \| ft²			300,000
TPH Borrower [Member] \| West Palm Beach Florida Loan [Member]
Long-term Line of Credit	$ 9,100,000
Canadian Imperial Bank of Commerce [Member] \| Loans Payable [Member]
Debt Instrument, Face Amount		$ 52,400,000
Debt, Weighted Average Interest Rate					0.50%
RCG LV Debt VI REIT LLC [Member] \| Mezzanine Loan [Member]
Debt Instrument, Face Amount		$ 15,400,000