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Unaudited Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information
  Three Months Ended 
  March  31  June 30  September  30  December 31 
Fiscal 2015:            
Product sales $3,101,491  $1,960,363  $2,472,428  $2,694,407 
Gross margin  1,850,925   1,130,574   1,611,902   1,657,502 
Product development expenses  330,665   271,759   301,746   331,139 
Net operating income  820,052   213,983   626,850   461,437 
Net income  479,082   94,058   351,292   288,807 
Net income per common share:                
        Basic $0.16  $0.03  $0.12  $0.09 
        Diluted $0.15  $0.03  $0.11  $0.09 
                 
Fiscal 2014:                
Product sales $2,081,752  $1,539,719  $1,770,129  $2,205,275 
Gross margin  1,149,895   878,523   1,077,896   1,342,722 
Product development expenses  594,209   760,672   361,232   462,965 
Net operating income (loss)  12,561   (458,667)  40,853   198,856 
Net (loss) income  (13,335)  (294,781)  10,330   130,626 
Net (loss) income per common share:                
        Basic ($0.00) ($0.10) $0.00  $0.04 
        Diluted ($0.00) ($0.10) $0.00  $0.04 
                 
Fiscal 2013:                
Product sales $1,846,734  $1,366,493  $1,234,701  $1,559,248 
Gross margin  1,053,567   783,677   615,717   607,644 
Product development expenses  266,479   271,858   290,853   325,010 
Net operating income (loss)  326,666   23,722   (159,967)  (209,975)
Net income (loss)  204,310   6,452   57,336   (150,703)
                 
Net income (loss) per common share:                
        Basic $0.07  $0.00  $0.02  ($0.05)
        Diluted $0.07  $0.00  $0.02  ($0.05)