Basis of Presentation	6 Months Ended
	Jun. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of PresentationThe accompanying unaudited condensed consolidated financial statements of Gentex Corporation and Subsidiaries ("Gentex" or the "Company") included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission as defined in the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") 270 for interim financial information, and in accordance with financial standards generally accepted in the United States of America ("GAAP"). Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations, although the Company believes that the disclosures are adequate to make the information presented not misleading. It is suggested that these unaudited condensed consolidated financial statements be read in conjunction with the financial statements and notes thereto included in the Company's 2024 annual report on Form 10-K. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments, consisting of only a normal and recurring nature, necessary to present fairly the financial position of the Company as of June 30, 2025, and the results of operations and cash flows for the interim periods presented.