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Fair value (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Recurring |  |
Net liability arising from put/call options | $ 582,000 | $ 690,000
Fair Value, Inputs, Level 3 [Member] |  |
Recurring |  |
Net liability arising from put/call options | 582,000 | $ 690,000
Certificate of deposit [Member] |  |
Recurring |  |
Fair value, Assets | 2,500,000 |
Certificate of deposit [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring |  |
Fair value, Assets | $ 2,500,000 |

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