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STATEMENTS OF OPERATIONS (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Product sales $ 1,846,734 $ 1,717,109
Costs of goods sold 793,167 704,541
Gross margin 1,053,567 1,012,568
Product development expenses 266,479 247,807
Administrative expenses 239,014 242,319
Sales and marketing expenses 221,408 241,209
Operating expenses 726,901 731,335
NET OPERATING INCOME 326,666 281,233
Other revenues (expenses), net 44,032 (10,509)
INCOME BEFORE INCOME TAXES 370,698 270,724
Income tax expense 166,388 115,963
NET INCOME $ 204,310 $ 154,761
Weighted average common shares outstanding:    
Basic (in shares) 3,019,034 3,016,067
Diluted (in shares) 3,083,546 3,102,848
NET INCOME PER SHARE:    
Basic (in dollars per share) $ 0.07 $ 0.05
Diluted (in dollars per share) $ 0.07 $ 0.05