Inventories (Schedule Of Inventories) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Inventories [Line Items]
Raw materials	$ 5,807	$ 6,372
Work-in process	2,545	2,871
Finished products and components	3,624	2,477
Total	11,976	11,720
Domestic Inventories [Member]
Inventories [Line Items]
Raw materials	4,069	4,198
Work-in process	1,838	1,793
Finished products and components	2,476	2,317
Total	8,383	8,308
Foreign Inventories [Member]
Inventories [Line Items]
Raw materials	1,738	2,174
Work-in process	707	1,078
Finished products and components	1,148	160
Total	$ 3,593	$ 3,412