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Intangible assets, net (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Subtotal	$ 4,807,569	$ 5,052,294
Less: Accumulated amortization	(4,615,716)	(4,846,323)
Intangible assets, net	191,853	205,971
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Subtotal	29,345	30,838
Land use rights
Finite-Lived Intangible Assets [Line Items]
Subtotal	299,224	314,456
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Subtotal	$ 4,479,000	$ 4,707,000

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
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