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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2013
Commitments and Contingencies Disclosure [Abstract]  
Schedule of product warranty activity

 

June 30, 2013

 

June 30, 2012

Beginning balance - January 1

$

2,671,409 

 

$

1,210,919 

     Additions for current period deliveries

366,941 

 

346,970 

     Reductions for payments made

(1,471,840)

 

(537,879)

Ending balance - June 30

$

1,566,510 

 

$

1,020,010