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Accounts Receivable
 3 Months Ended
Mar. 31, 2020
Receivables [Abstract]  
Accounts Receivable

4. Accounts Receivable

 

    March 31,
2020		     December 31,
2019		  
Accounts receivable   $ 7,939,833     $ 4,740,867  
Allowances for doubtful accounts     (267,362 )     (270,652 )
    $ 7,672,471     $ 4,470,215