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v3.21.2

Share-based payment (Details) - Schedule non-vested shares activity - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Non-vested share [Member] |  |  |
Share-based payment (Details) - Schedule non-vested shares activity [Line Items] |  |  |
Number of non-vested shares, Outstanding at the beginning balance | 20,523 | 34,800 | 43,723
Weighted Average Grant date fair value per share, Outstanding at the beginning balance | $ 182.13 | $ 149.40 | $ 139.80
Number of non-vested shares, Forfeited |  |  | (8,923)
Weighted Average Grant date fair value per share, Forfeited |  |  | $ 102.35
Number of non-vested shares, Outstanding at the ending balance |  | 20,523 | 34,800
Weighted Average Grant date fair value per share, Outstanding at the ending balance |  | $ 182.13 | $ 149.40
Number of non-vested shares, transfer to non-vested share units | (20,523) | (14,277) |
Weighted Average Grant date fair value per share, transfer to non-vested share units | $ 182.13 | $ 102.35 |
Non-vested share units [Member] |  |  |
Share-based payment (Details) - Schedule non-vested shares activity [Line Items] |  |  |
Number of non-vested shares, Outstanding at the beginning balance | 123,575 | 114,117 | 120,007
Weighted Average Grant date fair value per share, Outstanding at the beginning balance | $ 143.89 | $ 153.83 | $ 155.55
Number of non-vested shares, Forfeited | (446) | (4,819) | (5,890)
Weighted Average Grant date fair value per share, Forfeited | $ 227.24 | $ 255.99 | $ 188.84
Number of non-vested shares, Outstanding at the ending balance | 143,652 | 123,575 | 114,117
Weighted Average Grant date fair value per share, Outstanding at the ending balance | $ 149.10 | $ 143.89 | $ 153.83
Number of non-vested shares, transfer to non-vested share units | 20,523 | 14,277 |
Weighted Average Grant date fair value per share, transfer to non-vested share units | $ 182.13 | $ 102.35 |

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