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Fair value (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Recurring
Net liability arising from put/call options	$ 528,000	$ 690,000
Fair Value, Inputs, Level 3 [Member]
Recurring
Net liability arising from put/call options	$ 528,000	$ 690,000

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- References

No definition available.

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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

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