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Inventory (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Inventory Disclosure [Abstract]      
Allowance for inventory obsolescence $ 128,000    
Raw materials 22,381,000   20,524,000
Work in process 5,921,000   6,308,000
Inventory, net 28,302,000   26,832,000
Write-offs of obsolete inventory against allowance $ 0 $ 0