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v3.20.1

Notes payable (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019
Notes payable (Details) [Line Items] |  |
Notes payable |  |
Bank acceptance notes from bank | $ 3,642,616 |
Restricted Cash, Current | 3,642,616 |
Bank of Cangzhou [Member] |  |
Notes payable (Details) [Line Items] |  |
Bank acceptance notes from bank | $ 3,642,616 |
Description of maturity of notes payable | The bank acceptance notes from the bank bore interest rate at nil% per annum and 0.05% of notes amount as handling charge. The acceptance notes were due and paid off in January 2019. |
Handling charges of bank acceptance notes percentage | 0.05% |

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