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Warranty costs
6 Months Ended
Jun. 30, 2012
Warranty costs [Abstract]  
Warranty costs
Note 6 - Warranty costs

The following table provides the detail of the change in our product warranty accrual, which is a component of accrued liabilities on the Condensed Consolidated Balance Sheets as of June 30, 2012 and 2011:

 
 
For the three months ended June 30,
  
For the six months ended June 30,
 
 
 
2012
  
2011
  
2012
  
2011
 
Warranty accrual, beginning of period
 
892,920
  
580,451
  
785,412
  
529,374
 
Charges to cost and expenses relating to new sales
  
486,509
   
193,950
   
884,690
   
472,575
 
Costs of product warranty claims/change of estimate
  
(354,392
)
  
(258,697
)
  
(645,065
)
  
(486,245
)
Warranty accrual, end of period
 
1,025,037
  
515,704
  
1,025,037
  
515,704