Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Components of property, plant and equipment [Abstract]
Property, plant and equipment, Gross	$ 36,401,000	$ 34,786,000
Less accumulated depreciation	(30,544,000)	(29,527,000)
Property, plant and equipment, Net	5,857,000	5,259,000
Depreciation expense recorded	1,465,000	1,343,000
Rent received from leases	479,000	440,000
Future minimum rent payments due to Company [Abstract]
2013	404,000
2014	176,000
Total	580,000
Rental expense on operating leases	2,406,000	2,535,000
Future minimum lease payments under all non-cancelable operating leases [Abstract]
2013	1,967,000
2014	1,386,000
2015	625,000
2016	364,000
2017	367,000
Thereafter	0
Total	4,709,000
Maximum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	25 years
Minimum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	3 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	6,302,000	6,235,000
Building and improvements [Member] | Maximum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	25 years
Building and improvements [Member] | Minimum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	20 years
Rental property [Member]
Components of property, plant and equipment [Abstract]
Property, plant and equipment, Gross	5,289,000	5,289,000
Furniture and equipment [Member]
Components of property, plant and equipment [Abstract]
Property, plant and equipment, Gross	$ 24,557,000	$ 23,009,000
Furniture and equipment [Member] | Maximum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	8 years
Furniture and equipment [Member] | Minimum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives	3 years