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Property and Equipment (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Property and Equipment    
Computers and software $ 59,000us-gaap_CapitalizedComputerSoftwareGross $ 59,000us-gaap_CapitalizedComputerSoftwareGross
Machinery and equipment 209,000us-gaap_MachineryAndEquipmentGross 251,000us-gaap_MachineryAndEquipmentGross
Furniture and office equipment 86,000us-gaap_FurnitureAndFixturesGross 86,000us-gaap_FurnitureAndFixturesGross
Demonstration vehicles and buses 127,000us-gaap_PropertyPlantAndEquipmentOther 127,000us-gaap_PropertyPlantAndEquipmentOther
Plant And Property Gross 481,000us-gaap_PropertyPlantAndEquipmentGross 523,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (481,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (443,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total    $ 80,000us-gaap_PropertyPlantAndEquipmentNet