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Summary of significant accounting policies (Details 3) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating income (loss) | $ (249) | $ 114 | $ 771 |
Previously reported |  |  |  |
Operating income (loss) |  |  | $ 781 | $ (1,701)
Net income (loss) per ordinary share |  |  | $ 0.19 | $ 0.25
Net income (loss) per ordinary share diluted |  |  | $ 0.19 | $ 0.25
Weighted average number of ordinary shares outstanding |  |  | 5,154,759 | 3,092,859
Weighted average number of ordinary shares outstanding diluted |  |  | 5,154,759 | 3,092,859
Restatement |  |  |  |
Operating income (loss) |  |  | $ 771 | $ (272)
Net income (loss) per ordinary share |  |  | $ 0.13 | $ 0.10
Net income (loss) per ordinary share diluted |  |  | $ 0.13 | $ 0.10
Weighted average number of ordinary shares outstanding |  |  | 7,732,132 | 7,732,132
Weighted average number of ordinary shares outstanding diluted |  |  | 7,732,132 | 7,732,132

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