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Unaudited Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2016
Unaudited Quarterly Financial Data [Abstract]  
Schedule of quarterly financial information
  Three Months Ended 
  March 31  June 30  September 30  December 31 
Fiscal 2016:            
Product sales $2,986,359  $2,375,662  $1,968,122  $2,213,818 
Gross margin  1,757,560   1,239,861   1,204,627   1,218,647 
Product development expenses  302,443   380,434   307,721   253,737 
Net operating income  698,964   21,465   50,467   119,309 
Net income (loss)  452,448   (9,155)  34,870   30,285 
Net income (loss) per common share:                
Basic $0.12  $(0.00) $0.01  $0.01 
Diluted $0.11  $(0.00) $0.01  $0.01 
                 
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