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Significant accounting policies - Basic and diluted earnings per ordinary share - (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Significant accounting policies
Profits (loss) attributable to Himax Technologies, Inc. stockholders	$ 236,982	$ 436,896	$ 47,134
Denominator for basic earnings per ordinary share:
Weighted average number of ordinary shares outstanding	349,448	349,228	345,708
Basic earnings per ordinary share attributable to Himax Technologies, Inc. stockholders	$ 0.68	$ 1.25	$ 0.14
Basic earnings per ADS attributable to Himax Technologies, Inc. stockholders	$ 1.36	$ 2.50	$ 0.27

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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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