Quarterly report pursuant to Section 13 or 15(d)

Bank Loans (Details)

v3.21.2
Bank Loans (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Property, Plant and Equipment [Line Items]        
Weighted average interest rate for short-term bank loans 6.00% 4.00% 6.00% 4.00%
Weighted average interest rate for long-term bank loans 4.30% 4.80% 4.30% 4.80%
Interest expense $ 4,055,798 $ 4,220,271 $ 11,720,712 $ 11,064,621
Construction-in-Progress [Member]        
Property, Plant and Equipment [Line Items]        
Interest costs capitalized $ 183,747 $ 1,192,672