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Balance Sheet Details - Property, Plant and Equipment (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Details    
Land and improvements $ 1,270,242us-gaap_LandAndLandImprovements $ 1,238,150us-gaap_LandAndLandImprovements
Buildings and improvements 6,494,896us-gaap_BuildingsAndImprovementsGross 6,438,022us-gaap_BuildingsAndImprovementsGross
Machinery and equipment 32,032,724us-gaap_MachineryAndEquipmentGross 30,532,728us-gaap_MachineryAndEquipmentGross
Capitalized software and other 1,158,065us-gaap_PropertyPlantAndEquipmentOther 1,273,375us-gaap_PropertyPlantAndEquipmentOther
Less accumulated depreciation (30,077,932)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (29,073,155)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment, net $ 10,877,995us-gaap_PropertyPlantAndEquipmentNet $ 10,409,120us-gaap_PropertyPlantAndEquipmentNet