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Warranty (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Warranty        
Period of warranties, low end of the range     90 days 90 days
Period of warranties, high end of the range     1 year 1 year
Warranty provisions and claims for the years        
Beginning balance $ 240,550 $ 250,910 $ 240,621 $ 205,506
Acquired provision - Dansensor acquisition       85,413
Warranty provisions 134,327 135,779 300,827 292,657
Warranty claims (133,559) (128,749) (300,130) (325,636)
Ending balance $ 241,318 $ 257,940 $ 241,318 $ 257,940