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STATEMENTS OF OPERATIONS - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]    
SALES, NET $ 23,079,739 $ 20,853,527
COST OF SALES 8,298,240 7,971,676
GROSS PROFIT 14,781,499 12,881,851
OPERATING EXPENSES:    
Sales and marketing 6,701,837 5,912,977
General and administrative 3,896,947 3,332,830
Total operating expenses 10,598,784 9,245,807
INCOME FROM OPERATIONS 4,182,715 3,636,044
OTHER INCOME (EXPENSE)    
Interest income 26,591 25,257
Interest expense (457,689) (473,608)
Other income, net 187,969 258,812
INCOME BEFORE INCOME TAXES 3,939,586 3,446,505
INCOME TAX PROVISION (1,081,006) (452,726)
NET INCOME 2,858,580 2,993,779
Preferred stock dividends (1,018,915) (704,049)
INCOME APPLICABLE TO COMMON SHAREHOLDERS $ 1,839,665 $ 2,289,730
Basic income per common share after preferred dividends $ 0.37 $ 0.46
Weighted average number of basic common shares outstanding 4,964,529 4,985,219