Other Intangible Assets (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Other Intangible Assets
Gross amount	$ 2,987,000		$ 2,987,000		$ 2,987,000
Accumulated amortization	(2,510,000)		(2,510,000)		(2,351,000)
Net balance	477,000		477,000		636,000
Amortization expense related to intangible assets	79,000	$ 79,000	159,000	$ 159,000
Future amortization
2016	159,000		159,000
2017	318,000		318,000
Total	477,000		$ 477,000
Patents
Other Intangible Assets
Estimated useful life			14 years
Gross amount	429,000		$ 429,000		429,000
Accumulated amortization	(429,000)		$ (429,000)		(429,000)
Non-compete
Other Intangible Assets
Estimated useful life			5 years
Gross amount	512,000		$ 512,000		512,000
Accumulated amortization	(418,000)		(418,000)		(387,000)
Net balance	94,000		$ 94,000		125,000
Customer list
Other Intangible Assets
Estimated useful life			5 years
Gross amount	2,046,000		$ 2,046,000		2,046,000
Accumulated amortization	(1,663,000)		(1,663,000)		(1,535,000)
Net balance	$ 383,000		$ 383,000		$ 511,000