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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CONDENSED STATEMENTS OF OPERATIONS    
Sales, net $ 5,921,982 $ 6,178,576
Cost of sales:    
Cost of manufactured product 3,226,597 3,262,007
Royalty expense to shareholders 505,375 518,282
Total cost of sales 3,731,972 3,780,289
Gross profit 2,190,010 2,398,287
Operating expenses:    
Sales and marketing 909,572 859,164
Research and development 124,919 116,306
General and administrative 2,049,688 2,317,914
Total operating expenses 3,084,179 3,293,384
Loss from operations (894,169) (895,097)
Interest and other income 5,181 6,606
Interest expense, net (49,623) (53,810)
Loss before income taxes (938,611) (942,301)
Provision for income taxes 480 2,044
Net loss (939,091) (944,345)
Preferred stock dividend requirements (176,249) (227,749)
Loss applicable to common shareholders $ (1,115,340) $ (1,172,094)
Basic loss per share (in dollars per share) $ (0.04) $ (0.04)
Diluted loss per share (in dollars per share) $ (0.04) $ (0.04)
Weighted average common shares outstanding:    
Basic (in shares) 28,624,874 27,663,500
Diluted (in shares) 28,624,874 27,663,500