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8. SEGMENT REPORTING (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sales, net $ 5,461,039 $ 5,143,588 $ 15,814,950 $ 14,907,917
Cost of Sales 1,918,868 1,762,214 5,660,429 5,594,744
Gross Margin 3,542,171 3,381,374 10,154,521 9,313,173
Selling Expenses 1,627,497 1,446,240 4,640,062 4,093,510
Contribution Margin $ 1,914,674 $ 1,935,134 $ 5,514,459 $ 5,219,663
Percent of Sales 100.00% 100.00% 100.00% 100.00%
Direct Sales        
Sales, net $ 2,333,721 $ 2,263,453 $ 6,237,364 $ 5,747,579
Cost of Sales 542,154 555,817 1,580,697 1,510,003
Gross Margin 1,791,567 1,707,636 4,656,667 4,237,576
Selling Expenses 1,073,089 1,022,807 3,089,948 2,742,294
Contribution Margin $ 718,478 $ 684,829 $ 1,566,719 $ 1,495,282
Percent of Sales 42.70% 44.00% 39.40% 38.60%
Distributor Sales        
Sales, net $ 3,127,318 $ 2,880,135 $ 9,577,586 $ 9,160,338
Cost of Sales 1,376,714 1,206,397 4,079,732 4,084,741
Gross Margin 1,750,604 1,783,501 5,497,854 5,075,597
Selling Expenses 554,408 423,433 1,550,114 1,351,216
Contribution Margin $ 1,196,196 $ 1,331,200 $ 3,947,740 $ 3,724,381
Percent of Sales 57.30% 56.00% 60.60% 61.40%