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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
CONDENSED STATEMENTS OF OPERATIONS        
Sales, net $ 6,715,470 $ 6,876,362 $ 12,894,046 $ 12,916,740
Cost of sales:        
Cost of manufactured product 3,556,282 4,097,143 6,818,289 7,917,927
Royalty expense to shareholders 557,959 601,295 1,076,241 1,097,537
Total cost of sales 4,114,241 4,698,438 7,894,530 9,015,464
Gross profit 2,601,229 2,177,924 4,999,516 3,901,276
Operating expenses:        
Sales and marketing 1,012,105 1,062,825 1,871,269 2,159,519
Research and development 167,678 192,237 283,984 376,961
General and administrative 2,661,768 2,263,211 4,979,682 4,694,889
Total operating expenses 3,841,551 3,518,273 7,134,935 7,231,369
Income (loss) from operations (1,240,322) (1,340,349) (2,135,419) (3,330,093)
Litigation proceeds 7,724,826   7,724,826  
Interest and other income 9,314 8,436 15,920 18,832
Interest expense, net (53,143) (56,035) (106,953) (113,203)
Income (loss) before income taxes 6,440,675 (1,387,948) 5,498,374 (3,424,464)
Provision for income taxes 2,045 1,875 4,089 3,751
Net income (loss) 6,438,630 (1,389,823) 5,494,285 (3,428,215)
Preferred stock dividend requirements (227,554) (228,999) (455,303) (457,998)
Income (loss) applicable to common shareholders $ 6,211,076 $ (1,618,822) $ 5,038,982 $ (3,886,213)
Basic earnings (loss) per share (in dollars per share) $ 0.22 $ (0.06) $ 0.18 $ (0.14)
Diluted earnings (loss) per share (in dollars per share) $ 0.21 $ (0.06) $ 0.17 $ (0.14)
Weighted average common shares outstanding:        
Basic (in shares) 27,741,052 27,332,483 27,702,276 27,295,586
Diluted (in shares) 29,432,468 27,332,483 29,411,606 27,295,586