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Lease (Tables)
3 Months Ended
Mar. 31, 2021
ASU 2016-02 Transition [Abstract]  
Schedule of right-of-use assets
   Prepaid
land
 
   lease
payments
 
Balance as of January 1, 2021  $7,500,780 
Amortization charge for the period   (43,325)
Foreign exchange adjustment   (27,243)
Balance as of March 31, 2021  $7,430,212 
Schedule of net investment in sales-type leases
   December 31,   March 31, 
   2020   2021 
Total future minimum lease payments receivable  $1,210,305   $2,976,071 
Less: unearned income, representing interest   (124,653)   (271,838)
Present value of minimum lease payments receivables   1,085,652    2,704,233 
Less: Current portion   (235,245)   (836,714)
Non-current portion  $850,407   $1,867,519 
Schedule of future minimum lease payments receivable for sales type leases
12 months ending March 31,  Total Minimum Lease Payments to be Received   Amortization of Unearned Income   Net Investment in Sales Type Leases 
2022  $979,368   $142,654   $836,714 
2023   952,265    91,221    861,044 
2024   911,671    36,609    875,062 
2025   132,767    1,354    131,413 
2026   -    -    - 
Thereafter   -    -    - 
    2,976,071    271,838    2,704,233 
Schedule of maturities of lease liabilities
   Operating
leases
 
12 months ending March 31,    
2022  $11,162 
2023   133,945 
2024   122,783 
2025   - 
Thereafter   - 
Total undiscounted cash flows   267,890 
Less: imputed interest   (30,290)
Present value of lease liabilities  $237,600 
Schedule of lease term and discount rate
Lease term and discount rate    
   March 31,
2021
 
    
Weighted-average remaining lease term - years   2.83 
Operating leases     
      
Weighted-average discount rate (%)   6.175%