Property, Plant and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Components of property, plant and equipment
Land	$ 260	$ 260
Buildings and improvements	1,952	1,975
Office furniture and equipment	1,900	2,899
Tooling and equipment	3,883	3,775
Transportation equipment	223	223
Construction in progress	1,827	607
Property, plant and equipment, at cost	10,045	9,739
Accumulated depreciation	(4,873)	(6,128)
Property, plant & equipment, net	$ 5,172	$ 3,611