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Advances to suppliers | 12 Months Ended
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Dec. 31, 2021
Advances to suppliers |
Advances to suppliers | Note 7 – Advances to Suppliers ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
​ | ​ | 2021 | ​ | 2020
Advances to suppliers | ​ | $ | 3,459,374 | ​ | $ | 7,033,556
Allowance for doubtful accounts | ​ |  | (38,746) | ​ |  | (179,095)
Advances to suppliers, net | ​ | $ | 3,420,628 | ​ | $ | 6,854,461
​ The movement of allowance for doubtful accounts are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
Balance at beginning of period | ​ | $ | 179,095 | ​ | $ | 1,517,017
Change of allowance for doubtful accounts | ​ |  | (144,549) | ​ |  | (400,436)
Write off | ​ |  | (5) | ​ |  | (1,039,958)
Translation adjustments | ​ |  | 4,205 | ​ |  | 102,472
Balance at end of period | ​ | $ | 38,746 | ​ | $ | 179,095
​

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- Definition Advances to suppliers, net. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition The entire disclosure for advances to suppliers. + References No definition available. + Details
Name: | tanh_AdvancesToSuppliersTextBlock
Namespace Prefix: | tanh_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration