Quarterly report pursuant to Section 13 or 15(d)

Property, plant and equipment (Details)

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Property, plant and equipment (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Property, plant and equipment    
Total property, plant and equipment $ 49,600 $ 48,820
Less accumulated depreciation (29,587) (28,933)
Net property, plant and equipment 20,013 19,887
Land
   
Property, plant and equipment    
Total property, plant and equipment 960 960
Land improvements
   
Property, plant and equipment    
Total property, plant and equipment 1,777 1,768
Buildings
   
Property, plant and equipment    
Total property, plant and equipment 12,852 12,852
Machinery and equipment
   
Property, plant and equipment    
Total property, plant and equipment 24,314 24,286
Furniture and fixtures
   
Property, plant and equipment    
Total property, plant and equipment 7,492 7,465
Mobile equipment and other
   
Property, plant and equipment    
Total property, plant and equipment 1,201 1,138
Construction-in-process
   
Property, plant and equipment    
Total property, plant and equipment $ 1,004 $ 351