SCHEDULE III. REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances			$ 0
Initial Cost to Company, Land			554
Initial Cost to Company, Building & Improvements			1,880
Cost Capitalized Subsequent to Acquisition, Improvements			20
Gross Amount at which Carried at the Close of the Period, Land			554
Gross Amount at which Carried at the Close of the Period, Building & Improvements			1,900
Gross Amount at which Carried at the Close of the Period, Total	$ 2,454	$ 2,454	2,454	$ 2,454
Accumulated Depreciation	822	774	822	774
Reconciliation of total real estate carrying value [Roll Forward]
Balance at beginning of year	2,454	2,454
Improvements	0	0
Acquisitions	0	0
Disposition	0	0
Balance at end of year	2,454	2,454
Total cost for federal tax purposes at end of each year			2,454	$ 2,454
Reconciliation of accumulated depreciation [Roll Forward]
Balance at beginning of year	774	726
Depreciation expense	48	48
Dispositions	0	0
Balance at end of year	822	$ 774
Commercial Office Building, Greenwich, CT [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances			0
Initial Cost to Company, Land			554
Initial Cost to Company, Building & Improvements			1,880
Cost Capitalized Subsequent to Acquisition, Improvements			20
Gross Amount at which Carried at the Close of the Period, Land			554
Gross Amount at which Carried at the Close of the Period, Building & Improvements			1,900
Gross Amount at which Carried at the Close of the Period, Total	2,454		2,454
Accumulated Depreciation	$ 822		$ 822
Date Constructed	1970
Date Acquired	2001-04
Life on Which Depreciated Latest Income Statement	39 years
Reconciliation of total real estate carrying value [Roll Forward]
Balance at end of year	$ 2,454
Reconciliation of accumulated depreciation [Roll Forward]
Balance at end of year	$ 822