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Note 3 - Accounts Receivable, Net
 12 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Financing Receivables [Text Block]
NOTE
3
- ACCOUNTS RECEIVABLE, NET
 
Accounts receivable consisted of the following:
 
 
   
As of
December 31,
2019
    
As of
December 31,
2018
  
Accounts receivable
   $
50,651,104
     $
15,064,580
  
Less: allowance for doubtful accounts
    
(623,970
)
    
(658,104
)
Accounts receivable, net
   $
50,027,134
     $
14,406,476
  
 
Movement of allowance for doubtful accounts is as follows:
 
   
For the Years Ended
  
   
December 31,
2019
    
December 31,
2018
  
Beginning balance
   $
658,104
     $
567,108
  
Provision for doubtful accounts
    
(4,515
 )    
119,329
  
Less: write off/recovery
    
(29,619
 )    
(28,333
)
Ending balance
   $
623,970
     $
658,104