Property, Plant and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Components of property, plant and equipment [Abstract]
Property, plant and equipment, Gross	$ 23,032,000	$ 21,366,000
Less accumulated depreciation	(17,316,000)	(16,218,000)
Property, plant and equipment, Net	5,716,000	5,148,000
Depreciation expense recorded	1,137,000	1,052,000
Rent received from leases	264,000	359,000
Future minimum rent payments due in 2016	306,000
Future minimum rent payments due in 2017	246,000
Future minimum rent payments due in 2018	57,000
Rental expense on operating leases	1,400,000	1,300,000
Future minimum lease payments under all non-cancelable operating leases [Abstract]
2016	1,466,000
2017	1,149,000
2018	924,000
2019	860,000
2020	336,000
Thereafter	738,000
Total	$ 5,473,000
Minimum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	3 years
Maximum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	25 years
Land [Member]
Components of property, plant and equipment [Abstract]
Property, plant and equipment, Gross	$ 253,000	253,000
Building and improvements [Member]
Components of property, plant and equipment [Abstract]
Property, plant and equipment, Gross	$ 5,645,000	5,645,000
Building and improvements [Member] | Minimum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	20 years
Building and improvements [Member] | Maximum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	25 years
Rental property [Member]
Components of property, plant and equipment [Abstract]
Property, plant and equipment, Gross	$ 5,330,000	5,308,000
Rental property [Member] | Minimum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	20 years
Rental property [Member] | Maximum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	25 years
Furniture and equipment [Member]
Components of property, plant and equipment [Abstract]
Property, plant and equipment, Gross	$ 11,804,000	$ 10,160,000
Furniture and equipment [Member] | Minimum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	3 years
Furniture and equipment [Member] | Maximum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	8 years