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Business Segments and Geographic Information (Tables)
 3 Months Ended
Mar. 31, 2013
Segment Reporting [Abstract]  
Financial Information by Business Segment
Selected financial information of continuing operations by business segment is as follows:
 
 
 
Three months ended March 31,
 
 
2012
 
2013
Total Revenue
 
 
 
 
Fuel Storage & Vehicle Systems
 
$
5,905,304

 
$
4,407,257

Operating Income (Loss)
 
 
 
 
Fuel Storage & Vehicle Systems
 
$
(1,578,174
)
 
$
(1,918,880
)
Corporate
 
(2,457,161
)
 
(1,960,846
)
Total
 
$
(4,035,335
)
 
$
(3,879,726
)
Product Gross Profit
 
 
 
 
Fuel Storage & Vehicle Systems:
 
 
 
 
Net product sales
 
$
3,545,741

 
$
3,505,095

Cost of product sales
 
(2,506,879
)
 
(2,603,876
)
Gross profit
 
$
1,038,862

 
$
901,219

Capital Expenditures
 
 
 
 
Fuel Storage & Vehicle Systems
 
$
82,273

 
$
592,677

Corporate
 
582

 
—

Total
 
$
82,855

 
$
592,677

Depreciation
 
 
 
 
Fuel Storage & Vehicle Systems
 
$
253,827

 
$
244,287

Corporate
 
5,329

 
10,315

Total
 
$
259,156

 
$
254,602
Identifiable Assets by Reporting Segment
Identifiable assets by reporting segment are as follows:
 
 
 
December 31, 2012
 
March 31, 2013
Identifiable Assets
 
 
 
 
Fuel Storage & Vehicle Systems
 
$
22,488,400

 
$
24,244,419

Renewable Energy - Held for Sale
 
34,226,458

 
31,108,058

Corporate
 
4,546,502

 
3,048,929

 
 
$
61,261,360

 
$
58,401,406