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8. SEGMENT REPORTING (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sales, net $ 5,821,292 $ 5,313,784 $ 10,353,911 $ 9,764,329
Cost of Sales 2,099,186 2,124,850 3,741,561 3,832,530
Gross Margin 3,722,106 3,188,934 6,612,350 5,931,799
Selling Expenses 1,575,509 1,314,759 3,012,564 2,647,246
Contribution Margin $ 2,751,544 $ 2,474,075 $ 3,599,786 $ 3,284,553
Percent of Sales 100.00% 100.00% 100.00% 100.00%
Direct Sales        
Sales, net $ 2,353,487 $ 1,995,008 $ 3,903,643 $ 3,484,127
Cost of Sales 650,359 589,575 1,038,543 954,186
Gross Margin 1,703,128 1,405,433 2,865,100 2,529,941
Selling Expenses 1,030,106 862,458 2,016,858 1,719,463
Contribution Margin $ 673,022 $ 542,975 $ 848,242 $ 810,478
Percent of Sales 40.40% 37.50% 37.70% 35.70%
Distributor Sales        
Sales, net $ 3,467,805 $ 3,318,776 $ 6,450,268 $ 6,280,202
Cost of Sales 1,448,827 1,535,275 2,703,018 2,878,344
Gross Margin 2,018,978 1,783,501 3,747,250 3,401,858
Selling Expenses 545,403 452,301 995,706 927,783
Contribution Margin $ 1,473,575 $ 1,331,200 $ 2,751,544 $ 2,474,075
Percent of Sales 59.60% 62.50% 62.30% 64.30%