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STATEMENTS OF OPERATIONS - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sales, net $ 33,274,702 $ 34,493,838 $ 29,826,636
Cost of sales      
Total cost of sales 23,052,900 24,522,250 19,484,581
Gross profit 10,221,802 9,971,588 10,342,055
Operating expenses:      
Sales and marketing 4,404,441 4,658,548 4,025,786
Research and development 621,365 740,567 571,842
General and administrative 6,776,705 8,351,053 8,795,310
Impairment of assets     456,119
Total operating expenses 11,802,511 13,750,168 13,849,057
Income from insurance proceeds 260,514    
Loss from operations (1,320,195) (3,778,580) (3,507,002)
Interest and other income 144,124 65,695 26,522
Interest expense (177,190) (210,761) (213,295)
Loss before income taxes (1,353,261) (3,923,646) (3,693,775)
Provision (benefit) for income taxes (13,318) (187,608) 1,132
Net loss (1,339,943) (3,736,038) (3,694,907)
Preferred Stock dividend requirements (704,996) (704,996) (704,996)
Loss applicable to common shareholders $ (2,044,939) $ (4,441,034) $ (4,399,903)
Basic loss per share (in dollars per share) $ (0.06) $ (0.14) $ (0.15)
Diluted loss per share (in dollars per share) $ (0.06) $ (0.14) $ (0.15)
Weighted average common shares outstanding:      
Basic (in shares) 32,666,454 31,958,121 29,354,437
Diluted (in shares) 32,666,454 31,958,121 29,354,437
Costs of manufactured product      
Cost of sales      
Total cost of sales $ 20,108,798 $ 21,658,062 $ 16,957,073
Royalty expense to shareholder      
Cost of sales      
Total cost of sales $ 2,944,102 $ 2,864,188 $ 2,527,508