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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
	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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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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