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3. INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory
   March 31,
2020
  December 31,
2019
       
Raw materials  $29,717,087   $33,381,806 
Work-in-progress   17,139,411    14,455,665 
Finished goods   5,432,305    5,227,263 
Total inventories  $52,288,803   $53,064,734