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Bank Loans (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of bank loans
   March 31,
2021
   December 31,
2020
 
Mortgage loan  $4,893,661   $5,064,142 
Line of revolving loan   6,425,437    6,322,417 
           
Total bank loans  $11,319,098   $11,386,559 
           
Reclassifying as:          
Current portion  $6,425,437   $6,446,139 
Long-term portion (more than 12 months)   4,893,661    4,940,420 
           
Total bank loans  $11,319,098   $11,386,559