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Warranty (Tables)
 3 Months Ended
Mar. 31, 2013
Warranty  
Schedule of warranty provisions and claims

 

 

 

 

Three Months Ended
March 31,

 

 

 

2013

 

2012

 

Beginning balance

 

$

240,621

 

$

205,506

 

Warranty provisions

 

122,889

 

35,826

 

Warranty claims

 

(118,241

)

(61,007

)

Ending balance

 

$

245,269

 

$

180,325