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Material accounting policies - Basic and diluted earnings per ordinary share - (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Material accounting policies |  |  |
Profits attributable to Himax Technologies, Inc. stockholders | $ 79,755 | $ 50,616 | $ 236,982
Denominator for basic earnings per ordinary share: |  |  |
Weighted average number of ordinary shares outstanding | 349,593 | 348,990 | 349,448
Basic earnings per ordinary share attributable to Himax Technologies, Inc. stockholders | $ 0.23 | $ 0.15 | $ 0.68
Basic earnings per ADS attributable to Himax Technologies, Inc. stockholders | $ 0.46 | $ 0.29 | $ 1.36

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