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, 2014
Dec. 31, 2013
Property, plant and equipment    
Total property, plant and equipment $ 57,779 $ 56,660
Less accumulated depreciation (32,447) (31,794)
Net property, plant and equipment 25,332 24,866
Land [Member]
    
Property, plant and equipment    
Total property, plant and equipment 1,160 1,160
Land Improvements [Member]
    
Property, plant and equipment    
Total property, plant and equipment 1,849 1,849
Building [Member]
    
Property, plant and equipment    
Total property, plant and equipment 16,743 16,743
Machinery and Equipment [Member]
    
Property, plant and equipment    
Total property, plant and equipment 26,212 25,756
Furniture and Fixtures [Member]
    
Property, plant and equipment    
Total property, plant and equipment 9,013 8,772
Mobile Equipment and Other [Member]
    
Property, plant and equipment    
Total property, plant and equipment 1,222 1,267
Construction in Progress [Member]
    
Property, plant and equipment    
Total property, plant and equipment $ 1,580 $ 1,113