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Bank acceptance notes payable (Details)	Dec. 31, 2021 USD ($)	Apr. 19, 2021 USD ($)	Apr. 19, 2021 CNY (¥)	Mar. 31, 2021 USD ($)	Mar. 31, 2021 CNY (¥)	Dec. 31, 2020 USD ($)
Total	$ 0					$ 1,753,109
Bank acceptance notes payable issued by Zhang Jiagang Rural Commercial Bank
Total	0			$ 220,109	¥ 1,435,805	220,109
Commercial acceptance notes payable guaranteed by SPD Bank Lishui Branch
Total	$ 0	$ 1,533,000	¥ 10,000,000			$ 1,533,000

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- Definition

Current portion of the total carrying amount as of the balance sheet date due within one year or the operating cycle, if longer, on all notes payable to banks paid on an installment with long term maturities. This can include the amount of any loans from the applicant firm. This does not, however, include any mortgage balances.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a)(1),20)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_NotesPayableToBankCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	us-gaap_ShortTermDebtTypeAxis=tanh_BankAcceptanceNotesPayableIssuedByZhangjiagangRuralCommercialBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=tanh_CommercialAcceptanceNotesPayableGuaranteedBySpdbankLishuiBranchMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: