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6. SEGMENT REPORTING (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sales, net $ 5,568,654 $ 5,790,837 $ 12,090,549 $ 10,789,623
Cost of sales 2,067,122 2,292,479 4,676,975 4,010,629
Gross margin 3,501,532 3,498,358 7,413,574 6,778,994
Selling expenses 1,500,401 1,734,788 3,117,344 3,361,827
Contribution margin $ 2,001,131 $ 1,763,570 $ 4,296,230 $ 3,417,167
Percent of sales 100.00% 100.00% 100.00% 100.00%
Direct Sales        
Sales, net $ 2,202,642 $ 2,359,444 $ 4,154,953 $ 4,079,621
Cost of sales 489,596 689,204 967,228 1,032,643
Gross margin 1,713,046 1,670,240 3,187,725 3,046,978
Selling expenses 1,166,551 1,156,397 2,297,098 2,230,768
Contribution margin $ 546,495 $ 513,843 $ 890,627 $ 816,210
Percent of sales 39.60% 40.70% 34.40% 37.80%
Distributor Sales        
Sales, net $ 3,366,012 $ 3,431,393 $ 7,935,596 $ 6,710,002
Cost of sales 1,577,526 1,603,275 3,709,747 2,977,986
Gross margin 1,788,486 1,828,118 4,225,849 3,732,016
Selling expenses 333,850 578,391 820,246 1,131,059
Contribution margin $ 1,454,636 $ 1,249,727 $ 3,405,603 $ 2,600,957
Percent of sales 60.40% 59.30% 65.60% 62.20%