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Disaggregated revenue from contracts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Abstract]
Trading and manufacturing (revenue recognized at point in time)	$ 9,476	$ 11,877	$ 13,770
Engineering (revenue recognized over time)	3,881	5,522	6,334
Total revenues	$ 13,357	$ 17,399	$ 20,104

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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