Quarterly report pursuant to Section 13 or 15(d)

Bank Loans (Details)

v3.21.2
Bank Loans (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Property, Plant and Equipment [Line Items]        
Weighted average interest rate for short-term bank loans 6.00% 4.10% 6.00% 4.10%
Weighted average interest rate for long-term bank loans 4.20% 4.90% 4.20% 4.90%
Interest expense $ 4,422,481 $ 3,701,595 $ 8,640,280 $ 6,844,350
Interest costs capitalized 0 765,066 0 1,008,925
Construction-in-Progress [Member]        
Property, Plant and Equipment [Line Items]        
Interest costs capitalized $ 0 $ 765,066 $ 0 $ 1,008,925