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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
CONDENSED STATEMENTS OF OPERATIONS        
Sales, net $ 9,482,866 $ 10,886,680 $ 22,376,912 $ 23,803,420
Cost of sales:        
Cost of manufactured product 5,489,151 6,191,232 12,307,440 14,109,159
Royalty expense to shareholders 770,197 843,730 1,846,438 1,941,267
Total cost of sales 6,259,348 7,034,962 14,153,878 16,050,426
Gross profit 3,223,518 3,851,718 8,223,034 7,752,994
Operating expenses:        
Sales and marketing 954,955 919,842 2,826,224 3,079,361
Research and development 125,780 129,189 409,764 506,150
General and administrative 2,342,165 2,381,799 7,321,847 7,076,688
Total operating expenses 3,422,900 3,430,830 10,557,835 10,662,199
Income (loss) from operations (199,382) 420,888 (2,334,801) (2,909,205)
Litigation proceeds     7,724,826  
Interest and other income 4,916 7,598 20,836 26,430
Interest expense, net (58,316) (55,185) (165,269) (168,388)
Income (loss) before income taxes (252,782) 373,301 5,245,592 (3,051,163)
Provision for income taxes 2,044 1,876 6,133 5,627
Net income (loss) (254,826) 371,425 5,239,459 (3,056,790)
Preferred stock dividend requirements (227,499) (228,999) (682,802) (686,997)
Income (loss) applicable to common shareholders $ (482,325) $ 142,426 $ 4,556,657 $ (3,743,787)
Basic earnings (loss) per share (in dollars per share) $ (0.02) $ 0.01 $ 0.16 $ (0.14)
Diluted earnings (loss) per share (in dollars per share) $ (0.02) $ 0.00 $ 0.15 $ (0.14)
Weighted average common shares outstanding:        
Basic (in shares) 27,873,447 27,394,061 27,759,333 27,326,966
Diluted (in shares) 27,873,447 29,173,359 29,436,008 27,326,966