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Himax Technologies, Inc. (the Parent Company only) (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenues $ 723,605 $ 685,167
Costs and expenses 720,220 676,808
Operating Income (loss) 3,385 8,359
Interest income 2,429 2,225
Changes in fair value of financial assets at fair value through profit or loss 2,036 23,226
Foreign currency exchange losses, net (369) (1,659)
Finance costs (1,232) (878)
Profit before income taxes 7,020 30,092
Income tax expense 994 4,554
Profit for the year 6,026 25,538
Parent Company [member]    
Revenues 0 0
Costs and expenses 273 236
Operating Income (loss) (273) (236)
Interest income 200 170
Changes in fair value of financial assets at fair value through profit or loss 2,094 0
Foreign currency exchange losses, net (257) 0
Finance costs (3,491) (2,322)
Share of profits of subsidiaries and affiliates 10,296 30,068
Profit before income taxes 8,569 27,680
Income tax expense 0 0
Profit for the year $ 8,569 $ 27,680