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Fair value (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Recurring |  |
Fair value, Assets | $ 404,000 | $ 128,000
Net liability arising from put/call options | 404,000 | 128,000
Recurring | Certificate of deposit |  |
Recurring |  |
Fair value of net assets | 2,518,493 | 2,500,000
Recurring | Certificate of deposit | Fair Value, Inputs, Level 2 [Member] |  |
Recurring |  |
Fair value of net assets | 2,518,493 | 2,500,000
Recurring | Net asset arising from put/call options |  |
Recurring |  |
Fair value of net assets | 404,000 | 128,000
Recurring | Net asset arising from put/call options | Fair Value, Inputs, Level 3 [Member] |  |
Recurring |  |
Fair value of net assets | $ 404,000 | $ 128,000

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