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Fair value (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Recurring |  |
Net liability arising from put/call options | $ 559,000 | $ 690,000
Fair Value, Inputs, Level 3 [Member] |  |
Recurring |  |
Net liability arising from put/call options | $ 559,000 | $ 690,000

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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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