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STATEMENTS OF OPERATIONS - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]    
Sales, net $ 27,314,852 $ 24,749,263
Cost of sales 10,585,076 9,454,681
Gross profit 16,729,776 15,294,582
OPERATING EXPENSES:    
Sales and marketing 7,458,139 7,449,088
General and administrative 4,269,864 4,117,970
Total operating expenses 11,728,003 11,567,058
Income from operations 5,001,773 3,727,524
OTHER INCOME (EXPENSE)    
Interest income 21,022 48,066
Interest expense (414,061) (440,999)
Other income, net 165,916 128,433
Income before income taxes 4,774,650 3,463,024
Income tax provision (1,379,654) (952,123)
Net income 3,394,996 2,510,901
Preferred stock dividends (1,116,378) (1,026,063)
Income applicable to common shareholders $ 2,278,618 $ 1,484,838
Earnings per common share after preferred dividends, basic and diluted $ .46 $ 0.30
Weighted-average number of common shares outstanding 4,964,529 4,964,529