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Financial instruments (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Recurring
Net liability arising from put/call options	$ 664,000	$ 0
Net asset arising from put/call options	0	24,000
Fair Value, Inputs, Level 1 [Member]
Recurring
Net liability arising from put/call options	0
Net asset arising from put/call options		0
Fair Value, Inputs, Level 2 [Member]
Recurring
Net liability arising from put/call options	0
Net asset arising from put/call options		0
Fair Value, Inputs, Level 3 [Member]
Recurring
Net liability arising from put/call options	$ 664,000
Net asset arising from put/call options		$ 24,000

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- References

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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Name Accounting Standards Codification
-Topic 820
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-Section 50
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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

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