Property and Equipment (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Property and Equipment
Computers and software	$ 515,000	$ 580,000
Machinery and equipment	271,000	535,000
Furniture and office equipment	87,000	87,000
Demonstration vehicles and buses	617,000	675,000
Leasehold improvements		1,327,000
Plant And Property Gross	1,490,000	3,204,000
Less accumulated depreciation and amortization	(1,251,000)	(2,897,000)
Total	$ 239,000	$ 307,000