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Property and Equipment
6 Months Ended
Jun. 30, 2011
Property and Equipment [Abstract]  
Property and Equipment
4. Property and Equipment
     Property and equipment consisted of the following at:
                 
    June 30,     December 31,  
    2011     2010  
Computers and software
  $ 604,000     $ 601,000  
Machinery and equipment
    862,000       958,000  
Furniture and office equipment
    98,000       98,000  
Demonstration vehicles and buses
    774,000       650,000  
Leasehold improvements
    1,348,000       1,348,000  
 
           
 
    3,686,000       3,655,000  
Less accumulated depreciation and amortization
    (2,598,000 )     (2,483,000 )
 
           
Total
  $ 1,088,000     $ 1,172,000  
 
           
     Depreciation and amortization expense was $253,000 and $271,000 for the six months ended June 30, 2011 and 2010, respectively, and within those total expenses, the amortization of leasehold improvements was $131,000 and $134,000 for the six months ended June 30, 2011 and 2010, respectively. Depreciation and amortization expense was $129,000 and $134,000 for the three months ended June 30, 2011 and 2010, respectively, and within those total expenses, the amortization of leasehold improvements was $65,000 and $67,000 for the three months ended June 30, 2011 and 2010.