Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2012

Property, plant and equipment

Summary of property, plant and equipment

	December 31,
	2012			2011
Land	$	960		$	960
Land improvements		1,768			1,768
Buildings		12,852			12,660
Machinery and equipment		24,286			23,253
Furniture and fixtures		7,465			7,255
Mobile equipment and other		1,138			1,216
Construction-in-process		351			748
Total property, plant and equipment		48,820			47,860
Less accumulated depreciation		(28,933	)		(26,520	)
Net property, plant and equipment	$	19,887		$	21,340