Acquisitions	12 Months Ended
Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
Acquisitions	ACQUISITIONSOn March 3, 2021 the Company acquired Guardian for approximately $12.0 million. Guardian is an Israeli research and development company that specializes in in-cabin sensing technologies for the automotive industry. The Company funded the acquisition with cash on hand. The valuation process was completed during the fourth quarter of 2021.Guardian is now a 100% owned subsidiary of the Company as Gentex Technologies (Israel), LTD, and is classified within the Automotive segment. The Company accounted for the acquisition under the provisions of FASB ASC Topic 805, Business Combinations.

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-URI https://asc.fasb.org/topic&trid=2303972

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4946-128472

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