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Long-lived Assets
 3 Months Ended
Mar. 31, 2013
Property, Plant and Equipment [Abstract]  
Long-lived Assets
Long-lived Assets
Property and equipment
Changes in property and equipment of continuing operations for the three months ended March 31, 2013 are as follows:
 
 
 
Balance at
December 31,
2012
 
Additions
 
Transfers
 
Depreciation
 
Balance at
March 31, 2013
Property and equipment in service, gross
 
$
31,295,376

 
$
—

 
$
400,729

 
$
—

 
$
31,696,105

Accumulated depreciation
 
(28,837,522
)
 
 
 
 
 
(254,602
)
 
(29,092,124
)
Construction in progress:
 
 
 
 
 
 
 
 
 
 
Plant equipment & other
 
751,789

 
592,677

 
(400,729
)
 
 
 
943,737

Total property and equipment, net
 
$
3,209,643

 
$
592,677

 
$
—

 
$
(254,602
)
 
$
3,547,718


Goodwill
The carrying amount of goodwill of continuing operations, reported in our Fuel Storage & Vehicle Systems business segment, was $12.4 million at both December 31, 2012 and March 31, 2013.
Indicators of Impairment
We believe that no event or circumstance currently exists that would indicate a potential impairment of the carrying values of property and equipment, goodwill, or any other significant long-lived operating asset as of March 31, 2013.