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Long term investments (Details) ¥ in Thousands, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 29, 2019 USD ($) | Jan. 10, 2018 USD ($) km² | Mar. 31, 2021 km² | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Apr. 03, 2020 USD ($) | Apr. 03, 2020 CNY (¥) | Apr. 02, 2020 | Nov. 29, 2019 CNY (¥) | Jan. 10, 2018 CNY (¥)
Other than Temporary Impairment Losses, Investments | $ |  |  |  | $ 0 | $ 0 | $ 0 |  |  |  |  |
Libo Haokun [Member] |  |  |  |  |  |  |  |  |  |  |
Amount of investment |  | $ 18,800 |  |  |  |  |  |  |  |  | ¥ 120,000
Equity Method Investment, Ownership Percentage |  | 18.00% |  |  |  |  |  |  |  |  | 18.00%
Number of square kilometers, right to mine provided |  | 0.11 |  |  |  |  |  |  |  |  |
Jingning Zhonggang [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 82.00% |  |  |  |  |
Tantech [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 18.00% |  |  |  |  |
Fuquan Chengwang [Member] |  |  |  |  |  |  |  |  |  |  |
Amount of investment | $ 7,300 |  |  |  |  |  | $ 7,300 | ¥ 46,500 |  | ¥ 46,320 |
Equity Method Investment, Ownership Percentage | 18.00% |  |  |  |  | 100.00% | 14.76% | 14.76% | 18.00% | 18.00% |
Value of the mining rights | ¥ |  |  |  |  |  |  |  |  |  | ¥ 257,350 |
Number of days, consideration payable after the completion of transfer of ownership | 30 days |  |  |  |  |  |  |  |  |  |
Number of square kilometers, right to mine provided |  |  | 0.2607 |  |  |  |  |  |  |  |
Fuquan Chengwang [Member] | Tantech [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 18.00% | 18.00% |  |  |  |  |
Jingning Meizhongkuang [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 18.00% | 18.00% | 18.00% | 18.00% |  |  |

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