Inventories (Schedule Of Inventories) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Inventories [Line Items]
Raw materials	$ 6,548	$ 6,372
Work-in process	1,903	2,871
Finished products and components	2,666	2,477
Total	11,117	11,720
Domestic Inventories [Member]
Inventories [Line Items]
Raw materials	3,993	4,198
Work-in process	1,618	1,793
Finished products and components	2,433	2,317
Total	8,044	8,308
Foreign Inventories [Member]
Inventories [Line Items]
Raw materials	2,555	2,174
Work-in process	285	1,078
Finished products and components	233	160
Total	$ 3,073	$ 3,412