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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Summary of significant accounting policies |
Schedule of estimated useful lives for significant property and equipment | ​
​ | ​ | ​
Buildings |  | 20 years
Machinery and equipment | ​ | 5 - 10 years
Transportation equipment |  | 4 - 5 years
Office equipment |  | 4 - 5 years
Electronic equipment |  | 3 - 5 years
Schedule of estimated useful lives of intangible assets | ​
​ | ​ | ​
​ |  | Estimated Useful Life
Licenses and permits | ​ | Indefinite
Software |  | 5 - 10 years
Land use right |  | 50 years
Patents |  | 10 years
Schedule of currency exchange rates that were used in creating the consolidated financial statements | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2021 |  | December 31, 2020 |  | December 31, 2019
US$: RMB exchange rate | ​ | Period End |  | $ | 0.1569 | ​ | Period End |  | $ | 0.1533 |  | Period End |  | $ | 0.1436
​ |  | Average | ​ | $ | 0.1550 |  | Average | ​ | $ | 0.1448 |  | Average | ​ | $ | 0.1448

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- Definition Tabular disclosure of the U.S. dollar denominated balances, balances reported for financial reporting purposes and the differences between the two balances by each relevant line item on the financial statements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 + Details
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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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