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Inventory (Details) - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Inventory Disclosure [Abstract]      
Allowance for inventory obsolescence $ 44,000   $ 12,000
Raw materials 19,736,000   20,726,000
Finished Goods 1,029,000   1,051,000
Work in process 3,910,000   5,945,000
Inventory, net 24,675,000   $ 27,722,000
Write-offs of obsolete inventory against allowance $ 0 $ 0