Intangible Assets (Schedule Of Amortization Expense For Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 42	$ 43
Patents
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	25	26
Software
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	8	7
Marketing assets and customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	3	3
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 6	$ 7