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Inventories (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Classification of inventories [Abstract]    
Raw materials $ 1,588,000us-gaap_InventoryRawMaterialsNetOfReserves $ 1,834,000us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 1,572,000us-gaap_InventoryWorkInProcessNetOfReserves 1,490,000us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 1,038,000us-gaap_InventoryFinishedGoodsNetOfReserves 1,305,000us-gaap_InventoryFinishedGoodsNetOfReserves
Total Inventories, net 4,198,000us-gaap_InventoryNet 4,629,000us-gaap_InventoryNet
Inventory reserve for obsolescence $ 2,802,000us-gaap_InventoryValuationReserves $ 2,586,000us-gaap_InventoryValuationReserves