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Bank acceptance notes payable - Additional Information (Details)	Apr. 21, 2021 USD ($)	Dec. 31, 2021 USD ($)	Apr. 21, 2021 CNY (¥)	Apr. 19, 2021 USD ($)	Apr. 19, 2021 CNY (¥)	Mar. 31, 2021 USD ($)	Mar. 31, 2021 CNY (¥)	Dec. 31, 2020 USD ($)
Restricted Cash								$ 220,109
Notes Payable to Bank, Current		$ 0						1,753,109
Maximum
Minimum Percentage Of Balances Of Bankers Acceptance To Maintain Deposits		100.00%
Minimum
Minimum Percentage Of Balances Of Bankers Acceptance To Maintain Deposits		0.00%
Bank acceptance notes payable issued by SPD Bank Zhang Jiagang Branch
Minimum Percentage Of Balances Of Bankers Acceptance To Maintain Deposits		100.00%
Bank acceptance notes payable issued by Zhang Jiagang Rural Commercial Bank
Notes Payable to Bank, Current		$ 0				$ 220,109	¥ 1,435,805	220,109
Commercial acceptance notes payable guaranteed by SPD Bank Lishui Branch
Minimum Percentage Of Balances Of Bankers Acceptance To Maintain Deposits				100.00%	100.00%
Notes Payable to Bank, Current		$ 0		$ 1,533,000	¥ 10,000,000			$ 1,533,000
Debt Instrument, Term	1 year
Commercial acceptance notes payable guaranteed by SPD Bank Lishui Branch | Zhejiang Xinsen Industrial Co., Ltd.,
Collateral amount	$ 1,533,000		¥ 10,000,000

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- Definition

Minimum Percentage Of Balances Of Bankers Acceptance To Maintain Deposits

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- Definition

Amount of assets pledged to secure a debt instrument.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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
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- Definition

Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586

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