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Warranty (Tables)
 12 Months Ended
Dec. 31, 2012
Warranty  
Schedule of warranty provisions and claims

 

 

Description
  Balance at
Beginning of
Year		   Acquired
provision—
Dansensor		   Warranty
Provisions		   Warranty
Claims		   Balance at
End of Year		  

Year ended December 31, 2012:

                                

Allowance for product warranties

   $ 205,506     85,413     374,758     425,056     240,621  

Year ended December 31, 2011:

                                

Allowance for product warranties

   $ 217,819     —     227,112     239,425     205,506  

Year ended December 31, 2010:

                                

Allowance for product warranties

   $ 209,710     —     305,167     297,058     217,819