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Subsequent events (Details) - Loan payable to Bank of China Lishui Branch [Member] - Tantech Charcoal [Member]
¥ in Millions
Jul. 09, 2020
CNY (¥)
item
Jan. 06, 2020
CNY (¥)
item
Feb. 26, 2019
CNY (¥)
item
Jul. 09, 2020
USD ($)
Jan. 06, 2020
USD ($)
Feb. 26, 2019
USD ($)
Subsequent Event [Line Items]            
Amount of borrowing   ¥ 10.0 ¥ 10.0   $ 1,415,000 $ 1,436,000
Debt Instrument, Term   6 months 1 year      
Annual interest rate   4.00% 4.35%   4.00% 4.35%
Number of Guarantors   2 2      
Subsequent Event [Member] | Notes Payable to Banks [Member]            
Subsequent Event [Line Items]            
Amount of borrowing ¥ 19.3     $ 2,700,000    
Debt Instrument, Term 1 year          
Annual interest rate 4.85%     4.85%    
Number of Guarantors 3