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Segment information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue $ 14,949 $ 21,388 $ 13,357
Operating income / (loss) 114 771 (272)
Depreciation 33 38 49
Capital expenditures, gross 7 4 11
Assets 19,363 21,250  
Liabilities 4,557 6,449  
Trading and Manufacturing      
Revenue 9,332 9,619 9,476
Operating income / (loss) (246) 130 941
Depreciation 28 32 39
Capital expenditures, gross 2 1 2
Assets 13,637 7,969  
Liabilities 1,300 3,428  
Engineering      
Revenue 5,617 11,769 3,881
Operating income / (loss) 590 846 (1,027)
Depreciation 5 6 10
Capital expenditures, gross 5 3 9
Assets 5,726 13,281  
Liabilities 3,257 3,021  
Unallocated Corporate Expenses      
Operating income / (loss) $ (230) $ (205) $ (186)