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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sales, net $ 11,202,217 $ 7,932,474
Cost of sales    
Total cost of sales 7,671,783 5,442,155
Gross profit 3,530,434 2,490,319
Operating expenses    
Sales and marketing 1,135,980 875,546
Research and development 138,537 127,456
General and administrative 1,775,204 1,662,095
Total operating expenses 3,049,721 2,665,097
Income (loss) from operations 480,713 (174,778)
Interest and other income (expense) (141,417) 91,432
Interest expense (33,849) (45,875)
Income (loss) before income taxes 305,447 (129,221)
Provision (benefit) for income taxes (17,326)  
Net income (loss) 322,773 (129,221)
Preferred Stock dividend requirements (174,143) (176,249)
Income (loss) applicable to common shareholders $ 148,630 $ (305,470)
Basic earnings (loss) per share $ 0.00 $ (0.01)
Diluted earnings (loss) per share $ 0.00 $ (0.01)
Weighted average common shares outstanding:    
Basic (in shares) 32,681,204 32,666,454
Diluted (in shares) 32,745,972 32,666,454
Costs of manufactured product    
Cost of sales    
Total cost of sales $ 6,802,675 $ 4,776,744
Royalty expense to shareholder    
Cost of sales    
Total cost of sales $ 869,108 $ 665,411