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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Sales, net $ 7,932,474 $ 7,672,801
Cost of sales    
Total cost of sales 5,442,155 4,813,205
Gross profit 2,490,319 2,859,596
Operating expenses    
Sales and marketing 875,546 1,165,461
Research and development 127,456 144,227
General and administrative 1,662,095 1,706,881
Total operating expenses 2,665,097 3,016,569
Loss from operations (174,778) (156,973)
Interest and other income 91,432 28,151
Interest expense (45,875) (50,392)
Loss before income taxes (129,221) (179,214)
Provision for income taxes   70
Net loss (129,221) (179,284)
Preferred Stock dividend requirements (176,249) (176,249)
Loss applicable to common shareholders $ (305,470) $ (355,533)
Basic loss per share (in dollars per share) $ (0.01) $ (0.01)
Diluted loss per share (in dollars per share) $ (0.01) $ (0.01)
Weighted average common shares outstanding:    
Basic (in shares) 32,666,454 32,666,454
Diluted (in shares) 32,666,454 32,666,454
Costs of manufactured product    
Cost of sales    
Total cost of sales $ 4,776,744 $ 4,181,010
Royalty expense to shareholder    
Cost of sales    
Total cost of sales $ 665,411 $ 632,195