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ADVANCES FROM CUSTOMERS (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Contract with Customer, Asset and Liability
Advances from customers consist of the following and is analyzed as long-term and short-term portion respectively:
 
 
 
December 31,
 
 
 
2017
 
 
2018
 
Customer A
 
$
994,196
 
 
$
15,827,579
 
Customer B
 
 
-
 
 
 
1,017,427
 
Customer C
 
 
4,651,317
 
 
 
-
 
Customer D
 
 
2,856,363
 
 
 
-
 
Customer E
 
 
2,291,448
 
 
 
-
 
Others
 
 
5,584,200
 
 
 
637,934
 
Total
 
$
16,377,524
 
 
$
17,482,940
 
Less: Advances from customers – short-term portion
 
$
16,377,524
 
 
$
10,213,940
 
Advances from customers – long-term portion
 
$
-
 
 
$
7,269,000