Gentex (GNTX) 10-Q 5 Nov 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Oct. 22, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	0-10235
Entity Registrant Name	GENTEX CORPORATION
Entity Central Index Key	0000355811
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Incorporation, State or Country Code	MI
Entity Tax Identification Number	38-2030505
Entity Address, Address Line One	600 N. Centennial
Entity Address, City or Town	Zeeland
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	49464
City Area Code	616
Local Phone Number	772-1800
Title of 12(b) Security	Common Stock, par value $0.06 per share
Trading Symbol	GNTX
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		236,520,081

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2021	Dec. 31, 2020	[1]
CURRENT ASSETS
Cash and cash equivalents	$ 269,965,105	$ 423,371,036
Short-term investments	6,936,547	27,164,369
Accounts receivable, net	241,225,710	284,925,335
Inventories	292,599,881	226,291,843
Prepaid expenses and other	63,979,883	17,577,981
Total current assets	874,707,126	979,330,564
PLANT AND EQUIPMENT—NET	451,811,914	468,135,135
OTHER ASSETS
Goodwill	314,805,654	311,922,787
Long-term investments	204,671,558	162,028,068
Intangible assets, net	243,163,539	249,748,127
Patents and other assets, net	27,268,962	26,776,489
Total other assets	789,909,713	750,475,471
Total assets	2,116,428,753	2,197,941,170
CURRENT LIABILITIES
Accounts payable	100,532,642	84,784,423
Accrued liabilities	91,909,057	92,952,434
Total current liabilities	192,441,699	177,736,857
OTHER NON-CURRENT LIABILITIES	18,680,307	17,300,442
DEFERRED INCOME TAXES	17,676,461	38,960,743
Total liabilities	228,798,467	233,998,042
SHAREHOLDERS’ INVESTMENT
Common stock	14,192,076	14,621,572
Additional paid-in capital	865,063,949	852,771,508
Retained earnings	1,005,103,661	1,089,698,996
Accumulated other comprehensive income	3,270,600	6,851,052
Total shareholders’ investment	1,887,630,286	1,963,943,128
Total liabilities and shareholders’ investment	$ 2,116,428,753	$ 2,197,941,170
[1]	The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

Unaudited Condensed Consolida_2

Unaudited Condensed Consolidated Statements of Income - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
NET SALES		$ 399,598,744	$ 474,638,584	$ 1,311,328,609	$ 1,158,325,866
COST OF GOODS SOLD		258,698,723	286,401,872	835,531,679	769,556,865
Gross profit		140,900,021	188,236,712	475,796,930	388,769,001
OPERATING EXPENSES:
Engineering, research and development		29,750,973	27,812,730	86,462,112	86,421,121
Selling, general & administrative		22,984,108	21,571,093	67,511,555	65,206,080
Total operating expenses		52,735,081	49,383,823	153,973,667	151,627,201
Income from operations		88,164,940	138,852,889	321,823,263	237,141,800
OTHER INCOME
Investment income		856,351	1,825,257	2,782,900	5,733,939
Other income, net		872,943	2,218,852	2,370,527	3,423,881
Total other income		1,729,294	4,044,109	5,153,427	9,157,820
INCOME BEFORE PROVISION FOR INCOME TAXES		89,894,234	142,896,998	326,976,690	246,299,620
PROVISION FOR INCOME TAXES		13,233,686	25,804,396	50,358,854	42,075,250
NET INCOME		$ 76,660,548	$ 117,092,602	$ 276,617,836	$ 204,224,370
EARNINGS PER SHARE:
Basic (in dollars per share)	[1]	$ 0.32	$ 0.48	$ 1.15	$ 0.83
Diluted (in dollars per share)	[1]	0.32	0.48	1.15	0.82
Cash Dividends Declared per Share (in dollars per share)		$ 0.120	$ 0.12	$ 0.360	$ 0.36
[1]	(1) Earnings Per Share has been adjusted to exclude the portion of net income allocated to participating securities as a result of share-based payment awards.

Unaudited Condensed Consolida_3

Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 76,660,548	$ 117,092,602	$ 276,617,836	$ 204,224,370
Other comprehensive income (loss) before tax:
Foreign currency translation adjustments	(349,165)	1,823,667	(238,378)	1,268,204
Unrealized (losses) gains on debt securities, net	(816,801)	(146,647)	(4,230,473)	5,655,644
Other comprehensive income (loss), before tax	(1,165,966)	1,677,020	(4,468,851)	6,923,848
Income tax impact related to components of other comprehensive income (loss)	(171,528)	(30,796)	(888,399)	1,187,685
Other comprehensive income (loss), net of tax	(994,438)	1,707,816	(3,580,452)	5,736,163
Comprehensive income	$ 75,666,110	$ 118,800,418	$ 273,037,384	$ 209,960,533

Unaudited Condensed Consolida_4

Unaudited Condensed Consolidated Statements of Shareholders' Investment - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	$ 1,916,318,989	$ 1,822,607,413	$ 1,963,943,128	[1]	$ 1,938,087,820
Issuance of common stock from stock plan transactions	7,116,990	7,966,489	$ 20,773,874		23,677,181
Issuance of common stock related to acquisitions					3,559,229
Repurchases of common stock (in shares)			(9,000,000)
Repurchases of common stock	(90,581,913)	(31,660,862)	$ (304,195,755)		(210,480,446)
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock	7,492,763	7,306,543	20,114,921		19,093,196
Dividends declared	(28,382,653)	(29,407,702)	(86,043,266)		(88,285,214)
Net income	76,660,548	117,092,602	276,617,836		204,224,370
Other comprehensive (loss) income	(994,438)	1,707,816	(3,580,452)		5,736,163
Balance at end of period	$ 1,887,630,286	$ 1,895,612,299	$ 1,887,630,286		$ 1,895,612,299
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	238,966,589	245,775,488	243,692,869		251,277,515
Balance at beginning of period	$ 14,337,995	$ 14,746,529	$ 14,621,572		$ 15,076,651
Issuance of common stock from stock plan transactions (in shares)	398,873	461,983	1,838,789		1,815,270
Issuance of common stock from stock plan transactions	$ 23,932	$ 27,719	$ 110,327		$ 108,917
Issuance of common stock related to acquisitions (in shares)					163,718
Issuance of common stock related to acquisitions					$ 9,823
Repurchases of common stock (in shares)	(2,830,850)	(1,175,756)	(8,997,046)		(8,194,788)
Repurchases of common stock	$ (169,851)	$ (70,545)	$ (539,823)		$ (491,688)
Ending balance (in shares)	236,534,612	245,061,715	236,534,612		245,061,715
Balance at end of period	$ 14,192,076	$ 14,703,703	$ 14,192,076		$ 14,703,703
Additional  Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	859,678,392	818,678,880	852,771,508		807,928,139
Issuance of common stock from stock plan transactions	7,093,058	7,938,770	20,663,547		23,568,264
Issuance of common stock related to acquisitions					3,549,406
Repurchases of common stock	(9,200,264)	(3,515,510)	(28,486,027)		(23,730,322)
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock	7,492,763	7,306,543	20,114,921		19,093,196
Balance at end of period	865,063,949	830,408,683	865,063,949		830,408,683
Retained  Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	1,038,037,564	986,442,760	1,089,698,996		1,116,372,133
Repurchases of common stock	(81,211,798)	(28,074,807)	(275,169,905)		(186,258,436)
Dividends declared	(28,382,653)	(29,407,702)	(86,043,266)		(88,285,214)
Net income	76,660,548	117,092,602	276,617,836		204,224,370
Balance at end of period	1,005,103,661	1,046,052,853	1,005,103,661		1,046,052,853
Accumulated  Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	4,265,038	2,739,244	6,851,052		(1,289,103)
Other comprehensive (loss) income	(994,438)	1,707,816	(3,580,452)		5,736,163
Balance at end of period	$ 3,270,600	$ 4,447,060	$ 3,270,600		$ 4,447,060
[1]	The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

Unaudited Condensed Consolida_5

Unaudited Condensed Consolidated Statements of Shareholders' Investment (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared (in dollars per share)	$ 0.120	$ 0.12	$ 0.360	$ 0.36

Unaudited Condensed Consolida_6

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 276,617,836	$ 204,224,370
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	75,105,881	78,489,026
(Gain) on disposal of assets	(459,528)	(281,542)
Loss on disposal of assets	213,430	146,195
(Gain) on sale of investments	(969,971)	(1,504,757)
Loss on sale of investments	192,346	143,370
Change in deferred income taxes	(20,269,706)	(9,559,993)
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock	20,114,921	23,266,906
Change in operating assets and liabilities:
Accounts receivable, net	43,704,625	(32,832,997)
Inventories	(66,308,038)	15,659,539
Prepaid expenses and other	(45,504,501)	8,934,297
Accounts payable	15,748,219	(7,389,582)
Accrued liabilities, excluding dividends declared and short-term debt	1,195,477	49,749,418
Net cash provided by operating activities	299,380,991	329,044,250
Activity in available-for-sale securities:
Sales proceeds	34,250,068	15,559,590
Maturities and calls	26,110,000	117,172,368
Purchases	(86,228,584)	(59,933,780)
Plant and equipment additions	(44,357,786)	(37,048,073)
Proceeds from sale of plant and equipment	2,550,805	331,465
Acquisition of businesses, net of cash acquired	(12,023,440)	(8,043,217)
Increase in other assets	(2,763,847)	(3,326,783)
Net cash (used for) provided by investing activities	(82,462,784)	24,711,570
CASH FLOWS (USED FOR) FINANCING ACTIVITIES:
Proceeds from borrowings on Credit Agreement	0	75,000,000
Repayment of borrowings on Credit Agreement	0	(50,000,000)
Issuance of common stock from stock plan transactions	20,773,874	23,677,181
Cash dividends paid	(86,902,257)	(87,774,635)
Repurchases of common stock	(304,195,755)	(210,480,446)
Net cash (used for) financing activities	(370,324,138)	(249,577,900)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(153,405,931)	104,177,920
CASH AND CASH EQUIVALENTS, beginning of period	423,371,036	296,321,622
CASH AND CASH EQUIVALENTS, end of period	$ 269,965,105	$ 400,499,542

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of PresentationThe unaudited condensed consolidated financial statements included herein have been prepared by the Company, pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States 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 2020 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 September 30, 2021, and the results of operations and cash flows for the interim periods presented.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill represents the cost of an acquisition in excess of the fair values assigned to identifiable net assets acquired. The Company recorded Goodwill of: $307.4 million as part of the HomeLink ® acquisition in 2013; $3.7 million as part of the acquisition of Vaporsens, Inc. ("Vaporsens") in the second quarter of 2020; and $0.9 million as a part of the acquisition of Argil, Inc. ("Argil") in the fourth quarter of 2020. During the third quarter of 2021, the Company made adjustments as part of the open measurement periods for Argil and for Air-Craftglass Production BV ("Air-Craftglass"), which was acquired in the third quarter of 2020. The Company reduced Goodwill recorded for Argil by $0.1 million and recorded an additional $0.2 million for Air-Craftglass during the third quarter of 2021. The Company also recorded $2.8 million in Goodwill as part of the acquisition of Guardian Optical Technologies ("Guardian") in the first quarter of 2021. See Note 15 for more information on these transactions. The carrying value of Goodwill as of both September 30, 2021 and December 31, 2020 was $314.8 million and $311.9 million, respectively, as set forth in the table below: Carrying Amount Balance as of December 31, 2020 $ 311,922,787 Acquisitions 2,848,364 Divestitures — Impairments — Other (Net Measurement Period Adjustments) 34,503 Balance as of September 30, 2021 $ 314,805,654 In addition to annual impairment testing, which is performed as of the first day of the fourth quarter, the Company continuously monitors for events and circumstances that could negatively impact the key assumptions in determining fair value of goodwill or other intangible assets thus resulting in the need for interim impairment testing, including long-term revenue growth projections, profitability, discount rates, recent market valuations from transactions by comparable companies, volatility in the Company's market capitalization, and general industry, market and macroeconomic conditions. The impact of COVID-19, the recent microchip shortage, supply chain constraints, and labor shortages were again considered in the most recently completed quarter, but did not indicate the need for interim impairment testing. The Company also acquired In-Process Research & Development ("I P R & D") as part of the acquisition of: Vaporsens; Air-Craftglass; and Argil, each of which has been previously disclosed. The Company also acquired I P R & D as part of the acquisition of Guardian in the first quarter of 2021. See Note 15 for more information on the Guardian transaction. The patents and intangible assets and related change in carrying values are set forth in the tables below: As of September 30, 2021: Other Intangible Assets Gross Accumulated Amortization Net Assumed Useful Life Gentex Patents $ 39,124,090 $ (25,858,926) $ 13,265,164 Various Vaporsens Technology Licenses 346,654 (62,740) 283,914 Various Other Intangible Assets HomeLink ® Trade Names and Trademarks $ 52,000,000 $ — $ 52,000,000 Indefinite HomeLink ® Technology 180,000,000 (120,000,000) 60,000,000 12 years Existing Customer Platforms 43,000,000 (34,400,000) 8,600,000 10 years Exclusive Licensing Agreement 96,000,000 — 96,000,000 Indefinite Vaporsens In-Process R&D 11,000,000 — 11,000,000 Indefinite Argil In-Process R&D 6,278,132 — 6,278,132 Indefinite Air-Craftglass In-Process R&D 800,000 — 800,000 Indefinite Guardian In-Process R&D 8,485,407 — 8,485,407 Indefinite Total Other Intangible Assets $ 397,563,539 $ (154,400,000) $ 243,163,539 Total Patents & Other Intangible Assets $ 437,034,283 $ (180,321,666) $ 256,712,617 As of December 31, 2020: Other Intangible Assets Gross Accumulated Amortization Net Assumed Useful Life Gentex Patents $ 38,625,292 $ (24,528,853) $ 14,096,439 Various Vaporsens Technology Licenses 300,985 (38,856) 262,129 Various Other Intangible Assets HomeLink ® Trade Names and Trademarks $ 52,000,000 $ — $ 52,000,000 Indefinite HomeLink ® Technology 180,000,000 (108,750,000) 71,250,000 12 years Existing Customer Platforms 43,000,000 (31,175,000) 11,825,000 10 years Exclusive Licensing Agreement 96,000,000 — 96,000,000 Indefinite Vaporsens In-Process R&D 11,000,000 — 11,000,000 Indefinite Argil In-Process R&D 6,278,132 — 6,278,132 Indefinite Air-Craftglass In-Process R&D 1,394,995 — 1,394,995 Indefinite Total Other Intangible Assets $ 389,673,127 $ (139,925,000) $ 249,748,127 Total Patents & Other Intangible Assets $ 428,599,404 $ (164,492,709) $ 264,106,695 Amortization expense on patents and intangible assets was approximately $5.5 million and $16.7 million during the three and nine months ended September 30, 2021, respectively, compared to approximately $5.6 million and $16.8 million for the same periods ended September 30, 2020, respectively.

Investments

Investments	9 Months Ended
	Sep. 30, 2021
Investments [Abstract]
Investments	Investments The Company follows the provisions of Accounting Standards Codification ("ASC") 820, Fair Value Measurements and Disclosures , for its financial assets and liabilities, and for its non-financial assets and liabilities subject to fair value measurements. ASC 820 provides a framework for measuring the fair value of assets and liabilities. This framework is intended to provide increased consistency in how fair value determinations are made under various existing accounting standards that permit, or in some cases, require estimates of fair-market value. This standard also expanded financial statement disclosure requirements with respect to a company’s use of fair-value measurements, including the effect of such measurements on earnings. The cost of securities sold is based on the specific identification method. The Company determines the fair value of its government securities, asset-backed securities, municipal bonds, and corporate bonds by utilizing monthly valuation statements that are provided by its broker. The broker determines the investment valuation by utilizing the bid price in the market and also refers to third party sources to validate valuations, and as such are classified as Level 2 assets. The Company's certificates of deposit are classified as available for sale and are considered as Level 1 assets. These investments are carried at cost, which approximates fair value. The Company also periodically makes technology investments in certain non-consolidated third-parties. These equity investments are accounted for in accordance with ASC 321, Investments - Equity Securities . Equity investments that do not have readily determinable fair values, and where the Company has not identified any observable events that would cause adjustment of the valuation to date, are then held at cost. These technology investments totaled approximately $14.0 million and $4.0 million as of September 30, 2021 and December 31, 2020, respectively. These investments are classified within Long-Term Investments in the consolidated balance sheets. Assets or liabilities that have recurring fair value measurements are shown below as of September 30, 2021 and December 31, 2020: As of September 30, 2021: Fair Value Measurements at Reporting Date Using Total as of Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Description September 30, 2021 (Level 1) (Level 2) (Level 3) Cash & Cash Equivalents $ 269,965,105 $ 269,965,105 $ — $ — Short-Term Investments: Certificate of Deposit 1,765,030 1,765,030 — — Corporate Bonds 2,032,660 — 2,032,660 — Municipal Bonds 1,334,868 — 1,334,868 — Other 1,803,989 1,803,989 — — Long-Term Investments: Asset Backed Securities 27,739,691 — 27,739,691 — Certificate of Deposit 2,073,655 2,073,655 — — Corporate Bonds 32,845,042 — 32,845,042 — Government Securities 39,596,133 — 39,596,133 — Municipal Bonds 88,368,667 — 88,368,667 — Total $ 467,524,840 $ 275,607,779 $ 191,917,061 $ — As of December 31, 2020: Fair Value Measurements at Reporting Date Using Total as of Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Description December 31, 2020 (Level 1) (Level 2) (Level 3) Cash & Cash Equivalents $ 423,371,036 $ 423,371,036 $ — $ — Short-Term Investments: Certificate of Deposit 1,516,693 1,516,693 — — Corporate Bonds 7,155,600 — 7,155,600 — Government Securities 6,678,450 — 6,678,450 — Municipal Bonds 10,284,765 — 10,284,765 — Other 1,528,861 1,528,861 — — Long-Term Investments: Asset-backed Securities 37,924,537 — 37,924,537 — Certificate of Deposit 3,645,520 3,645,520 — Corporate Bonds 9,024,035 — 9,024,035 — Municipal Bonds 107,407,831 — 107,407,831 — Total $ 608,537,328 $ 430,062,110 $ 178,475,218 $ — The amortized cost, unrealized gains and losses, and market value of investment securities are shown as of September 30, 2021 and December 31, 2020: As of September 30, 2021: Unrealized Cost Gains Losses Market Value Short-Term Investments: Certificate of Deposit $ 1,750,589 $ 14,441 $ — $ 1,765,030 Corporate Bonds 1,992,456 40,204 — 2,032,660 Municipal Bonds 1,334,020 848 — 1,334,868 Other 1,803,989 — — 1,803,989 Long-Term Investments: Asset Backed Securities 28,223,803 80,480 (564,592) 27,739,691 Certificate of Deposit 2,002,082 71,573 — 2,073,655 Corporate Bonds 32,791,105 300,347 (246,410) 32,845,042 Government Securities 39,704,080 9,126 (117,073) 39,596,133 Municipal Bonds 84,489,341 4,009,321 (129,995) 88,368,667 Total $ 194,091,465 $ 4,526,340 $ (1,058,070) $ 197,559,735 As of December 31, 2020: Unrealized Cost Gains Losses Market Value Short-Term Investments: Certificate of Deposit $ 1,502,187 $ 14,506 $ — $ 1,516,693 Corporate Bonds 7,084,638 70,962 — 7,155,600 Government Securities 6,635,132 43,318 — 6,678,450 Municipal Bonds 10,160,376 124,389 — 10,284,765 Other 1,528,861 — — 1,528,861 Long-Term Investments: Asset-backed Securities 37,681,113 800,802 (557,378) 37,924,537 Certificate of Deposit 3,503,898 141,622 — 3,645,520 Corporate Bonds 8,595,020 429,015 — 9,024,035 Municipal Bonds 100,776,325 6,635,428 (3,922) 107,407,831 Total $ 177,467,550 $ 8,260,042 $ (561,300) $ 185,166,292 Unrealized losses on investments as of September 30, 2021, are as follows: Aggregate Unrealized Losses Aggregate Fair Value of Investments Loss duration of less than one year $ 496,385 $ 63,013,355 Loss duration of greater than one year 561,685 7,864,526 Total $ 1,058,070 $ 70,877,881 Unrealized losses on investments as of December 31, 2020, are as follows: Aggregate Unrealized Losses Aggregate Fair Value of Investments Loss duration of less than one year $ 561,300 $ 12,317,187 Loss duration of greater than one year — — Total $ 561,300 $ 12,317,187 Effective January 1, 2020, the Company adopted ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instrument s. The guidance modifies the impairment model for available-for-sale debt securities and provides a simplified accounting model for purchased financial assets with credit deterioration since their origination. The Company utilized the guidance provided by ASC 326 to determine whether any of the available-for-sale debt securities held by the Company were impaired. No investments were considered to be impaired during the periods presented. The Company has the intention and current ability to hold its debt investments until any amortized cost basis has been recovered. Fixed income securities as of September 30, 2021 have contractual maturities as follows: Due within one year $ 5,132,558 Due between one and five years 61,209,692 Due over five years 129,413,495 $ 195,755,745

Inventories

Inventories	9 Months Ended
	Sep. 30, 2021
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consisted of the following at the respective balance sheet dates: September 30, 2021 December 31, 2020 Raw materials $ 209,029,089 $ 151,688,455 Work-in-process 33,882,944 32,791,675 Finished goods 49,687,848 41,811,713 Total Inventory $ 292,599,881 $ 226,291,843

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The Company has unvested share-based payment awards with a right to receive non-forfeitable dividends, which are considered participating securities under ASC 260, Earnings Per Share . The Company allocates earnings to participating securities and computes earnings per share using the two-class method. Under the two-class method, net income per share is computed by dividing net income allocated to common shareholders by the weighted average number of common shares outstanding for the period. In applying the two-class method, net income is allocated to both common shares and participating securities based on their respective weighted average shares outstanding for the period. For a period of net loss, net loss is not allocated to participating securities. The following table sets forth the computation of basic and diluted net income per common share under the two-class method for the three and nine months ended September 30, 2021 and September 30, 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Basic Earnings Per Share Net Income $ 76,660,548 $ 117,092,602 $ 276,617,836 $ 204,224,370 Less: Dividends and undistributed earnings allocated to participating securities 1,240,581 1,697,281 4,240,503 2,906,048 Net Income available to common shareholders $ 75,419,967 $ 115,395,321 $ 272,377,333 $ 201,318,322 Basic weighted average shares outstanding 234,005,573 241,898,117 236,628,999 243,240,699 Net Income per share - Basic $ 0.32 $ 0.48 $ 1.15 $ 0.83 Diluted Earnings Per Share Allocation of Net Income used in basic computation $ 75,419,967 $ 115,395,321 $ 272,377,333 $ 201,318,322 Reallocation of undistributed earnings 2,943 4,742 13,289 6,731 Net Income available to common shareholders - Diluted $ 75,422,910 $ 115,400,063 $ 272,390,622 $ 201,325,053 Number of shares used in basic computation 234,005,573 241,898,117 236,628,999 243,240,699 Additional weighted average dilutive common stock equivalents 897,636 918,950 1,108,216 1,026,916 Diluted weighted average shares outstanding 234,903,209 242,817,067 237,737,215 244,267,615 Net Income per share - Diluted $ 0.32 $ 0.48 $ 1.15 $ 0.82 Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive 987,757 412,775 180,669 412,775

Stock-Based Compensation Plans

Stock-Based Compensation Plans	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation Plans As of September 30, 2021, the Company had two equity incentive plans, which include the Gentex Corporation 2019 Omnibus Incentive Plan ("2019 Omnibus Plan"), and an employee stock purchase plan. Those plans and any prior material amendments thereto have previously been approved by shareholders. The 2019 Omnibus Plan provides for the potential awards to: i) employees; and ii) non-employee directors of the Company or its subsidiaries, which potential awards may be stock options (both incentive stock options and non-qualified stock options), appreciation rights, restricted stock awards and restricted stock units, performance share awards and performance units, and other awards that are stock-based, cash-based or a combination of both. The 2019 Omnibus Plan replaced the Company's Employee Stock Option Plan, Second Restricted Stock Plan, and Amended and Restated Non-Employee Director Stock Option Plan (the "Prior Plans"), which were also approved by shareholders. Any existing awards previously granted under the Prior Plans remain outstanding in accordance with their terms and are governed by the Prior Plans as applicable. Readers should refer to Note 5 of the consolidated financial statements in the Company's Annual Report on Form 10-K for the calendar year ended December 31, 2020, for additional information related to the Prior Plans. The Company recognized total compensation expense for share-based payments of $7,492,763 for the three months ended September 30, 2021, and total compensation expense for share-based payments of $20,114,921 for the nine months ended September 30, 2021. The Company recognized compensation expense for share-based payments for the three months ended September 30, 2020 of $6,904,725 and $22,865,087 for the nine months ended September 30, 2020, which included approximately $4,173,710 in severance expense that was recognized during the second quarter of 2020. A portion of the compensation cost for share based payment awards is capitalized as part of inventory. 2019 Omnibus Incentive Plan The purpose of the 2019 Omnibus Incentive Plan is to attract and retain employees, officers, and directors of the Company and its subsidiaries and to motivate and provide such persons incentives and rewards for performance. Pursuant to the terms of the Plan, each type of award counts against the available shares based on a predetermined conversion rate (shown in the table below). As of September 30, 2021, 6,156,962 share awards have been granted under the Plan, resulting in 15,031,810 shares, of 45,000,000 total shares available, to be issued under the Plan. The shares issued are presented net of shares from canceled/expired options and shares. Shares Granted Conversion Rate Total Shares Under 2019 Omnibus Plan Non-Qualified Stock Options 3,256,685 1.00 3,256,685 Restricted Stock / Performance Shares 2,900,277 4.06 11,775,125 Total 6,156,962 15,031,810 Employee Stock Options Under the 2019 Omnibus Plan and the Employee Stock Option Plan, the option exercise price equals the stock’s market price on the date of grant. The options vest after one five The fair value of each option grant was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions for the indicated periods: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Dividend Yield (1) 1.83 % 1.98 % 1.86 % 1.99 % Expected volatility (2) 27.47 % 27.72 % 27.67 % 27.38 % Risk-free interest rate (3) 0.98 % 0.28 % 0.92 % 0.31 % Expected term of options (years) (4) 4.14 4.16 4.15 4.16 Weighted-avg. grant date fair value $6.32 $4.64 $6.49 $4.38 1. Represents the Company’s estimated cash dividend yield over the expected term of option grant. 2. Amount is determined based on analysis of historical price volatility of the Company’s common stock. The expected volatility is based on the daily percentage change in the price of the stock over a period equal to the expected term of the option grant. 3. Represents the U.S. Treasury yield over the expected term of the option grant. 4. Represents the period of time that options granted are expected to be outstanding. Based on analysis of historical option exercise activity, the Company has determined that all employee groups exhibit similar exercise and post-vesting termination behavior. Restricted Shares Restricted shares awarded under the 2019 Omnibus Plan and the Second Restricted Stock Plan entitle the shareholder to all rights of common stock ownership except that the shares may not be sold, transferred, pledged, exchanged or otherwise disposed of during the restriction period. The restriction period is determined by the Compensation Committee, appointed by the Board of Directors, but may not exceed ten years under the terms of such plans. As of September 30, 2021, the Company had unearned stock-based compensation of $48,175,427 associated with the restricted stock grants issued under the 2019 Omnibus Plan and the prior plan. The unearned stock-based compensation related to these grants is being amortized to compensation expense over the applicable restriction periods. Amortization expense from restricted stock in the three months ended September 30, 2021 was $5,215,981 and amortization expense from restricted stock grants in the nine months ended September 30, 2021 was $13,978,358. Amortization expense from restricted stock grants for the three months ended September 30, 2020 was $4,366,025 and amortization expense from restricted stock grants in the nine months ended September 30, 2020 was $16,271,774, which included $4,148,477 of severance related expense for the second quarter of 2020. Performance Shares Performance shares awarded under the 2019 Omnibus Plan are considered performance condition awards as attainment is based on the Company's performance relative to pre-established metrics. The fair value of such performance share awards was determined using the Company's average closing stock price on the twenty days preceding the date of grant. The expected attainment of the metrics for these awards is then analyzed each reporting period, and the related expense is adjusted based on expected attainment, if the then expected attainment differs from previous expectations. The cumulative effect on current and prior periods of a change in expected attainment is recognized in the period of change. As of September 30, 2021, the Company had unearned stock-based compensation of $7,967,733 associated with these performance share grants. The unearned stock-based compensation related to these grants is being amortized to compensation expense over the applicable performance periods. Amortization expense from performance share grants in the three and nine months ended September 30, 2021 was $581,830 and $1,387,584, respectively. Amortization expense from performance share grants in the three and nine months ended September 30, 2020 was $1,403,799 and $2,361,359, respectively. Employee Stock Purchase Plan The Company has an employee stock purchase plan covering 2,000,000 shares of common stock. Under the plan, the Company sells shares at 85% of the stock’s market price at date of purchase. Under ASC 718, Compensation - Stock Compensation , the 15% discounted value is recognized as compensation expense. As of September 30, 2021, the Company has issued 1,463,744 shares under this plan.

Comprehensive Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Comprehensive Income	Comprehensive Income Comprehensive income reflects the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. For the Company, comprehensive income represents net income adjusted for unrealized gains and losses on certain debt investments and foreign currency translation adjustments. The following table presents the net changes in the Company's accumulated other comprehensive income by component (all amounts shown are net of tax): Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Foreign currency translation adjustments: Balance at beginning of period $ 879,832 $ (2,940,052) $ 769,045 $ (2,384,589) Other Comprehensive income (loss) before reclassifications (349,165) 1,823,667 (238,378) 1,268,204 Net current-period change (349,165) 1,823,667 (238,378) 1,268,204 Balance at end of period 530,667 (1,116,385) 530,667 (1,116,385) Unrealized gains on available-for-sale debt securities: Balance at beginning of period 3,385,206 5,679,296 6,082,007 1,095,486 Other Comprehensive income (loss) before reclassifications (645,273) 208,503 (2,727,750) 5,543,455 Amounts reclassified from accumulated other comprehensive income — (324,354) (614,324) (1,075,496) Net current-period change (645,273) (115,851) (3,342,074) 4,467,959 Balance at end of period 2,739,933 5,563,445 2,739,933 5,563,445 Accumulated other comprehensive income, end of period $ 3,270,600 $ 4,447,060 $ 3,270,600 $ 4,447,060 The following table presents details of reclassifications out of accumulated other comprehensive income for the three and nine months ended September 30, 2021 and 2020: Details about Accumulated Other Comprehensive Income Components Amounts Reclassified from Other Comprehensive Income Affected Line item in the Consolidated Statements of Income Three Months Ended September 30, Nine Months Ended September 2021 2020 2021 2020 Unrealized gains on available-for-sale debt securities Realized gain on sale $ — $ 410,575 $ 777,625 $ 1,361,387 Investment income Provision for income taxes — (86,221) (163,301) (285,891) Provision for income taxes Total net reclassifications for the period $ — $ 324,354 $ 614,324 $ 1,075,496 Net of tax

Debt and Financing Arrangements

Debt and Financing Arrangements	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Debt and Financing Arrangements	Debt and Financing Arrangements On October 15, 2018, the Company entered into a Credit Agreement (“Credit Agreement”) with PNC as the administrative agent and sole lender. Pursuant to this Credit Agreement, the Company has access to a $150 million senior revolving credit facility (“Revolver”). Under the terms of the Credit Agreement, the Company is entitled to further request an additional aggregate principal amount of up to $100 million, subject to the satisfaction of certain conditions. In addition, the Company is entitled to the benefit of swing loans from amounts otherwise available under the Revolver in the aggregate principal amount of up to $20 million and to request Letters of Credit from amounts otherwise available under the Revolver in the aggregate principle amount up to $20 million, both subject to certain conditions. The obligations of the Company under the Credit Agreement are not secured, but are subject to certain covenants. As of September 30, 2021, there was no outstanding balance on the Revolver. The Revolver expires on October 15, 2023. The Credit Agreement contains customary representations and warranties and certain covenants that place certain limitations on the Company. As of September 30, 2021, the Company is in compliance with its covenants under the Credit Agreement.

Equity

Equity	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Equity	Equity The decrease in common stock during the nine months ended September 30, 2021, was primarily due to the repurchases of 9.0 million shares, partially offset by the issuance of 1.8 million shares of the Company’s common stock, net of cancellations, under the Company’s stock-based compensation plans. The total net decrease was 7.2 million shares. The Company recorded a cash dividend of $0.120 per share during the third quarter of 2021 as compared to a cash dividend of $0.120 per share during the third quarter of 2020. The third quarter 2021 dividend of $28.4 million was declared on August 4, 2021, and was paid on October 21, 2021.

Contingencies

Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Contingencies	ContingenciesThe Company is periodically involved in legal proceedings, legal actions and claims arising in the normal course of business, including proceedings relating to product liability, intellectual property, safety and health, employment, regulatory, and other matters. Such matters are subject to many uncertainties and outcomes are not predictable. The Company does not believe, however, that at the current time any of these matters constitute material pending legal proceedings that will have a material adverse effect on the financial position or future results of operations or cash flows of the Company.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Company's automotive segment develops and manufactures digital vision and connected car products and electronics, including: automatic-dimming rearview mirrors with and without electronic features; non-auto dimming rearview mirrors with and without electronic features; and other electronics. The Company also develops and manufactures variably dimming windows and laminate products for the aerospace industry and fire protection products for the commercial construction industry. In 2020, the Company acquired Vaporsens, which specializes in nanofiber chemical sensing. These three non-automotive segments are combined into the "Other" segment as shown below. In first quarter of 2021, the Company acquired Guardian, which is combined in the Automotive Segment below. Further information in regards to the Guardian transaction is included in Note 15 of the financial statements. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Revenue: Automotive Products $ 391,338,185 $ 464,673,587 $ 1,287,578,273 $ 1,126,597,020 Other 8,260,559 9,964,997 23,750,336 31,728,846 Total $ 399,598,744 $ 474,638,584 $ 1,311,328,609 $ 1,158,325,866 Income (Loss) from operations: Automotive Products $ 89,121,170 $ 138,428,628 $ 325,579,533 $ 233,149,936 Other (956,230) 424,261 (3,756,270) 3,991,864 Total $ 88,164,940 $ 138,852,889 $ 321,823,263 $ 237,141,800

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesThe effective tax rate was 15.4% in the nine months ended September 30, 2021, compared to an effective tax rate of 17.1% for the same period in 2020. Generally, effective tax rates for these periods differ from statutory federal income tax rates, due to provisions for state and local income taxes, permanent tax differences, and the foreign-derived intangible income tax deduction and research and development tax credits.

Revenue

Revenue	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue	Revenue The following table shows the Company’s Automotive revenue and Other Products revenue disaggregated by geographical location for Automotive Products for the three and nine month periods ended September 30,2021 and September 30, 2020: Three Months Ended September 30, Nine Months Ended September 30, Revenue 2021 2020 2021 2020 Automotive Products U.S. $ 128,570,314 $ 156,521,110 $ 410,852,689 $ 347,952,489 Germany 55,162,289 56,514,969 183,513,145 153,166,702 Japan 53,750,242 64,353,263 161,814,352 152,824,143 Mexico 25,239,690 33,342,171 85,574,821 92,882,253 Other 128,615,650 153,942,074 445,823,266 379,771,433 Total Automotive Products $ 391,338,185 $ 464,673,587 $ 1,287,578,273 $ 1,126,597,020 Other Products (U.S.) 8,260,559 9,964,997 23,750,336 31,728,846 Total Revenue $ 399,598,744 $ 474,638,584 $ 1,311,328,609 $ 1,158,325,866 Revenue by geographic area may fluctuate based on many factors, including: exposure to local economic, political and labor conditions; a pandemic; global supply chain constraints; unexpected changes in laws, regulations, trade or monetary or fiscal policy, including interest rates, foreign currency exchange rates and changes in the rate of inflation in the U.S. and other foreign countries; and tariffs, quotas, customs and other import or export restrictions and other trade barriers. The following table disaggregates the Company’s Automotive revenue and Other revenue by major source for the three and nine month periods ended September 30, 2021 and September 30, 2020: Three Months Ended September 30, Nine Months Ended September 30, Revenue 2021 2020 2021 2020 Automotive Segment Automotive Mirrors & Electronics $ 360,415,449 $ 427,426,159 $ 1,185,997,034 $ 1,039,112,012 HomeLink Modules* 30,922,736 37,247,428 101,581,239 87,485,008 Total Automotive Products $ 391,338,185 $ 464,673,587 $ 1,287,578,273 $ 1,126,597,020 Other Segment Fire Protection Products 5,886,227 6,378,303 18,010,048 17,384,594 Aerospace Products 2,374,332 3,586,694 5,740,288 14,344,252 Total Other $ 8,260,559 $ 9,964,997 $ 23,750,336 $ 31,728,846 *Excludes HomeLink revenue where HomeLink electronics are integrated into interior auto-dimming mirrors.

Leases

Leases	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Leases	Leases The Company has operating leases for corporate offices, warehouses, vehicles, and other equipment, which are included within "Plant and Equipment - Net" section of the Condensed Consolidated Balance Sheets. The leases have remaining lease terms of 1 year to 5 years. The weighted average remaining lease term for operating leases as of September 30, 2021 was 2 years, with a weighted average discount rate of 1.1%. Future minimum lease payments for operating leases as of September 30, 2021 were as follows: Year ending December 31, 2021 (excluding the nine months ended September 30, 2021) $ 388,416 2022 1,072,816 2023 548,316 2024 48,833 2025 6,287 Thereafter 127 Total future minimum lease payments 2,064,795 Less imputed interest (10,858) Total $ 2,053,937 Reported as of September 30, 2021 Accrued Liabilities $ 1,247,544 Other Non-Current Liabilities 806,393 Total $ 2,053,937

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Acquisitions	Acquisitions On September 18, 2020, the Company acquired the stock of Air-Craftglass, a Belgian company specializing in research and development of laminate products for the aviation industry, for an initial payment of $1.1 million. The Company funded the acquisition with a cash payment from cash on hand. The transaction also included contingent consideration based on future revenues of Air-Craftglass. The valuation process was completed during the third quarter of 2021. Air-Craftglass is now a 100% owned subsidiary of the Company, and is classified within the “Other” segment. The assets acquired and liabilities assumed as a part of this stock purchase were recorded at fair value on the acquisition date. The Company accounted for the acquisition under the provisions of FASB ASC Topic 805, Business Combinations . There were no revenues of the business of Air-Craftglass which were included in the Company’s condensed consolidated statements of income and comprehensive income for the year to date period ended September 30, 2021. On December 14, 2020, the Company acquired the stock of Argil for $3.7 million, which was in addition to the previous $4.2 million cash equity investment by the Company in Argil. The Company funded the acquisition with a cash payment from cash on hand. Argil specializes in electrochromic technology and research and development, which the Company anticipates using to complement and expand its product offerings and leverage for manufacturing efficiencies. The Company is still in the process of verifying data and finalizing information related to the valuation and recording of identifiable intangible assets, deferred taxes, net working capital, and the resulting effects on the amount of recorded goodwill. The Company expects to finalize these matters within the measurement period, which will remain open through the fourth quarter of 2021. Argil is now 100% owned and merged with the Company, and has been classified within the “Automotive” segment. The assets acquired and liabilities assumed as part of this stock purchase were recorded at fair value on the acquisition date. The Company accounted for the acquisition under the provisions of FASB ASC Topic 805, Business Combinations . There were no revenues of the business of Argil which were included in the Company’s condensed consolidated statements of income and comprehensive income for the year to date period ended September 30, 2021. On 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 a cash payment from cash on hand. The Company is still in the process of verifying data and finalizing information related to the valuation and recording of identifiable intangible assets, deferred taxes, net working capital, and the resulting effects on the amount of recorded goodwill. The Company expects to finalize these matters within the measurement period, which is currently expected to remain open through 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 . There were no revenues of the business of Guardian which were included in the Company’s condensed consolidated statement of income and comprehensive income for the year to date period ended September 30, 2021. The following table summarizes the fair values of the assets acquired, and the liabilities assumed, as of the acquisition date of March 3, 2021: Fair Value Current Assets $ 32,000 Personal Property 15,000 In-Process R&D 6,795,461 Trade Names and Trademarks 1,301,542 Deferred Tax Asset 1,049,073 Goodwill 2,848,364 Total Net Assets Acquired $ 12,041,440 Through September 30, 2021, the Company has incurred acquisition-related costs of approximately $375,000, which has been expensed as incurred in the "Selling, general & administrative" section of its Condensed Consolidated Income Statement.

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The carrying value of Goodwill as of both September 30, 2021 and December 31, 2020 was $314.8 million and $311.9 million, respectively, as set forth in the table below: Carrying Amount Balance as of December 31, 2020 $ 311,922,787 Acquisitions 2,848,364 Divestitures — Impairments — Other (Net Measurement Period Adjustments) 34,503 Balance as of September 30, 2021 $ 314,805,654
Schedule of Intangible Assets	The patents and intangible assets and related change in carrying values are set forth in the tables below: As of September 30, 2021: Other Intangible Assets Gross Accumulated Amortization Net Assumed Useful Life Gentex Patents $ 39,124,090 $ (25,858,926) $ 13,265,164 Various Vaporsens Technology Licenses 346,654 (62,740) 283,914 Various Other Intangible Assets HomeLink ® Trade Names and Trademarks $ 52,000,000 $ — $ 52,000,000 Indefinite HomeLink ® Technology 180,000,000 (120,000,000) 60,000,000 12 years Existing Customer Platforms 43,000,000 (34,400,000) 8,600,000 10 years Exclusive Licensing Agreement 96,000,000 — 96,000,000 Indefinite Vaporsens In-Process R&D 11,000,000 — 11,000,000 Indefinite Argil In-Process R&D 6,278,132 — 6,278,132 Indefinite Air-Craftglass In-Process R&D 800,000 — 800,000 Indefinite Guardian In-Process R&D 8,485,407 — 8,485,407 Indefinite Total Other Intangible Assets $ 397,563,539 $ (154,400,000) $ 243,163,539 Total Patents & Other Intangible Assets $ 437,034,283 $ (180,321,666) $ 256,712,617 As of December 31, 2020: Other Intangible Assets Gross Accumulated Amortization Net Assumed Useful Life Gentex Patents $ 38,625,292 $ (24,528,853) $ 14,096,439 Various Vaporsens Technology Licenses 300,985 (38,856) 262,129 Various Other Intangible Assets HomeLink ® Trade Names and Trademarks $ 52,000,000 $ — $ 52,000,000 Indefinite HomeLink ® Technology 180,000,000 (108,750,000) 71,250,000 12 years Existing Customer Platforms 43,000,000 (31,175,000) 11,825,000 10 years Exclusive Licensing Agreement 96,000,000 — 96,000,000 Indefinite Vaporsens In-Process R&D 11,000,000 — 11,000,000 Indefinite Argil In-Process R&D 6,278,132 — 6,278,132 Indefinite Air-Craftglass In-Process R&D 1,394,995 — 1,394,995 Indefinite Total Other Intangible Assets $ 389,673,127 $ (139,925,000) $ 249,748,127 Total Patents & Other Intangible Assets $ 428,599,404 $ (164,492,709) $ 264,106,695

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2021
Investments [Abstract]
Investment Securities Stated at Fair Value	Assets or liabilities that have recurring fair value measurements are shown below as of September 30, 2021 and December 31, 2020: As of September 30, 2021: Fair Value Measurements at Reporting Date Using Total as of Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Description September 30, 2021 (Level 1) (Level 2) (Level 3) Cash & Cash Equivalents $ 269,965,105 $ 269,965,105 $ — $ — Short-Term Investments: Certificate of Deposit 1,765,030 1,765,030 — — Corporate Bonds 2,032,660 — 2,032,660 — Municipal Bonds 1,334,868 — 1,334,868 — Other 1,803,989 1,803,989 — — Long-Term Investments: Asset Backed Securities 27,739,691 — 27,739,691 — Certificate of Deposit 2,073,655 2,073,655 — — Corporate Bonds 32,845,042 — 32,845,042 — Government Securities 39,596,133 — 39,596,133 — Municipal Bonds 88,368,667 — 88,368,667 — Total $ 467,524,840 $ 275,607,779 $ 191,917,061 $ — As of December 31, 2020: Fair Value Measurements at Reporting Date Using Total as of Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Description December 31, 2020 (Level 1) (Level 2) (Level 3) Cash & Cash Equivalents $ 423,371,036 $ 423,371,036 $ — $ — Short-Term Investments: Certificate of Deposit 1,516,693 1,516,693 — — Corporate Bonds 7,155,600 — 7,155,600 — Government Securities 6,678,450 — 6,678,450 — Municipal Bonds 10,284,765 — 10,284,765 — Other 1,528,861 1,528,861 — — Long-Term Investments: Asset-backed Securities 37,924,537 — 37,924,537 — Certificate of Deposit 3,645,520 3,645,520 — Corporate Bonds 9,024,035 — 9,024,035 — Municipal Bonds 107,407,831 — 107,407,831 — Total $ 608,537,328 $ 430,062,110 $ 178,475,218 $ —
Schedule of Amortized Cost, Unrealized Gains And Losses, And Market Value of Investment Securities	The amortized cost, unrealized gains and losses, and market value of investment securities are shown as of September 30, 2021 and December 31, 2020: As of September 30, 2021: Unrealized Cost Gains Losses Market Value Short-Term Investments: Certificate of Deposit $ 1,750,589 $ 14,441 $ — $ 1,765,030 Corporate Bonds 1,992,456 40,204 — 2,032,660 Municipal Bonds 1,334,020 848 — 1,334,868 Other 1,803,989 — — 1,803,989 Long-Term Investments: Asset Backed Securities 28,223,803 80,480 (564,592) 27,739,691 Certificate of Deposit 2,002,082 71,573 — 2,073,655 Corporate Bonds 32,791,105 300,347 (246,410) 32,845,042 Government Securities 39,704,080 9,126 (117,073) 39,596,133 Municipal Bonds 84,489,341 4,009,321 (129,995) 88,368,667 Total $ 194,091,465 $ 4,526,340 $ (1,058,070) $ 197,559,735 As of December 31, 2020: Unrealized Cost Gains Losses Market Value Short-Term Investments: Certificate of Deposit $ 1,502,187 $ 14,506 $ — $ 1,516,693 Corporate Bonds 7,084,638 70,962 — 7,155,600 Government Securities 6,635,132 43,318 — 6,678,450 Municipal Bonds 10,160,376 124,389 — 10,284,765 Other 1,528,861 — — 1,528,861 Long-Term Investments: Asset-backed Securities 37,681,113 800,802 (557,378) 37,924,537 Certificate of Deposit 3,503,898 141,622 — 3,645,520 Corporate Bonds 8,595,020 429,015 — 9,024,035 Municipal Bonds 100,776,325 6,635,428 (3,922) 107,407,831 Total $ 177,467,550 $ 8,260,042 $ (561,300) $ 185,166,292
Schedule of Unrealized Loss on Investments	Unrealized losses on investments as of September 30, 2021, are as follows: Aggregate Unrealized Losses Aggregate Fair Value of Investments Loss duration of less than one year $ 496,385 $ 63,013,355 Loss duration of greater than one year 561,685 7,864,526 Total $ 1,058,070 $ 70,877,881 Unrealized losses on investments as of December 31, 2020, are as follows: Aggregate Unrealized Losses Aggregate Fair Value of Investments Loss duration of less than one year $ 561,300 $ 12,317,187 Loss duration of greater than one year — — Total $ 561,300 $ 12,317,187
Investments Classified by Contractual Maturity Date	Fixed income securities as of September 30, 2021 have contractual maturities as follows: Due within one year $ 5,132,558 Due between one and five years 61,209,692 Due over five years 129,413,495 $ 195,755,745

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2021
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consisted of the following at the respective balance sheet dates: September 30, 2021 December 31, 2020 Raw materials $ 209,029,089 $ 151,688,455 Work-in-process 33,882,944 32,791,675 Finished goods 49,687,848 41,811,713 Total Inventory $ 292,599,881 $ 226,291,843

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share Basic And Diluted	The following table sets forth the computation of basic and diluted net income per common share under the two-class method for the three and nine months ended September 30, 2021 and September 30, 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Basic Earnings Per Share Net Income $ 76,660,548 $ 117,092,602 $ 276,617,836 $ 204,224,370 Less: Dividends and undistributed earnings allocated to participating securities 1,240,581 1,697,281 4,240,503 2,906,048 Net Income available to common shareholders $ 75,419,967 $ 115,395,321 $ 272,377,333 $ 201,318,322 Basic weighted average shares outstanding 234,005,573 241,898,117 236,628,999 243,240,699 Net Income per share - Basic $ 0.32 $ 0.48 $ 1.15 $ 0.83 Diluted Earnings Per Share Allocation of Net Income used in basic computation $ 75,419,967 $ 115,395,321 $ 272,377,333 $ 201,318,322 Reallocation of undistributed earnings 2,943 4,742 13,289 6,731 Net Income available to common shareholders - Diluted $ 75,422,910 $ 115,400,063 $ 272,390,622 $ 201,325,053 Number of shares used in basic computation 234,005,573 241,898,117 236,628,999 243,240,699 Additional weighted average dilutive common stock equivalents 897,636 918,950 1,108,216 1,026,916 Diluted weighted average shares outstanding 234,903,209 242,817,067 237,737,215 244,267,615 Net Income per share - Diluted $ 0.32 $ 0.48 $ 1.15 $ 0.82 Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive 987,757 412,775 180,669 412,775

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Schedule of Shares Issued, Net of Shares from Canceled/Expired Options and Shares	The shares issued are presented net of shares from canceled/expired options and shares. Shares Granted Conversion Rate Total Shares Under 2019 Omnibus Plan Non-Qualified Stock Options 3,256,685 1.00 3,256,685 Restricted Stock / Performance Shares 2,900,277 4.06 11,775,125 Total 6,156,962 15,031,810
Weighted-Average Assumptions For The Employee Stock Option Plan	The fair value of each option grant was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions for the indicated periods: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Dividend Yield (1) 1.83 % 1.98 % 1.86 % 1.99 % Expected volatility (2) 27.47 % 27.72 % 27.67 % 27.38 % Risk-free interest rate (3) 0.98 % 0.28 % 0.92 % 0.31 % Expected term of options (years) (4) 4.14 4.16 4.15 4.16 Weighted-avg. grant date fair value $6.32 $4.64 $6.49 $4.38 1. Represents the Company’s estimated cash dividend yield over the expected term of option grant. 2. Amount is determined based on analysis of historical price volatility of the Company’s common stock. The expected volatility is based on the daily percentage change in the price of the stock over a period equal to the expected term of the option grant. 3. Represents the U.S. Treasury yield over the expected term of the option grant. 4. Represents the period of time that options granted are expected to be outstanding. Based on analysis of historical option exercise activity, the Company has determined that all employee groups exhibit similar exercise and post-vesting termination behavior.

Comprehensive Income (Tables)

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Schedule of AOCI	The following table presents the net changes in the Company's accumulated other comprehensive income by component (all amounts shown are net of tax): Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Foreign currency translation adjustments: Balance at beginning of period $ 879,832 $ (2,940,052) $ 769,045 $ (2,384,589) Other Comprehensive income (loss) before reclassifications (349,165) 1,823,667 (238,378) 1,268,204 Net current-period change (349,165) 1,823,667 (238,378) 1,268,204 Balance at end of period 530,667 (1,116,385) 530,667 (1,116,385) Unrealized gains on available-for-sale debt securities: Balance at beginning of period 3,385,206 5,679,296 6,082,007 1,095,486 Other Comprehensive income (loss) before reclassifications (645,273) 208,503 (2,727,750) 5,543,455 Amounts reclassified from accumulated other comprehensive income — (324,354) (614,324) (1,075,496) Net current-period change (645,273) (115,851) (3,342,074) 4,467,959 Balance at end of period 2,739,933 5,563,445 2,739,933 5,563,445 Accumulated other comprehensive income, end of period $ 3,270,600 $ 4,447,060 $ 3,270,600 $ 4,447,060
Reclassifications Out of Other Comprehensive Income	The following table presents details of reclassifications out of accumulated other comprehensive income for the three and nine months ended September 30, 2021 and 2020: Details about Accumulated Other Comprehensive Income Components Amounts Reclassified from Other Comprehensive Income Affected Line item in the Consolidated Statements of Income Three Months Ended September 30, Nine Months Ended September 2021 2020 2021 2020 Unrealized gains on available-for-sale debt securities Realized gain on sale $ — $ 410,575 $ 777,625 $ 1,361,387 Investment income Provision for income taxes — (86,221) (163,301) (285,891) Provision for income taxes Total net reclassifications for the period $ — $ 324,354 $ 614,324 $ 1,075,496 Net of tax

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Schedule of Automotive and Other Segment Reporting	These three non-automotive segments are combined into the "Other" segment as shown below. In first quarter of 2021, the Company acquired Guardian, which is combined in the Automotive Segment below. Further information in regards to the Guardian transaction is included in Note 15 of the financial statements. Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Revenue: Automotive Products $ 391,338,185 $ 464,673,587 $ 1,287,578,273 $ 1,126,597,020 Other 8,260,559 9,964,997 23,750,336 31,728,846 Total $ 399,598,744 $ 474,638,584 $ 1,311,328,609 $ 1,158,325,866 Income (Loss) from operations: Automotive Products $ 89,121,170 $ 138,428,628 $ 325,579,533 $ 233,149,936 Other (956,230) 424,261 (3,756,270) 3,991,864 Total $ 88,164,940 $ 138,852,889 $ 321,823,263 $ 237,141,800

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table shows the Company’s Automotive revenue and Other Products revenue disaggregated by geographical location for Automotive Products for the three and nine month periods ended September 30,2021 and September 30, 2020: Three Months Ended September 30, Nine Months Ended September 30, Revenue 2021 2020 2021 2020 Automotive Products U.S. $ 128,570,314 $ 156,521,110 $ 410,852,689 $ 347,952,489 Germany 55,162,289 56,514,969 183,513,145 153,166,702 Japan 53,750,242 64,353,263 161,814,352 152,824,143 Mexico 25,239,690 33,342,171 85,574,821 92,882,253 Other 128,615,650 153,942,074 445,823,266 379,771,433 Total Automotive Products $ 391,338,185 $ 464,673,587 $ 1,287,578,273 $ 1,126,597,020 Other Products (U.S.) 8,260,559 9,964,997 23,750,336 31,728,846 Total Revenue $ 399,598,744 $ 474,638,584 $ 1,311,328,609 $ 1,158,325,866 The following table disaggregates the Company’s Automotive revenue and Other revenue by major source for the three and nine month periods ended September 30, 2021 and September 30, 2020: Three Months Ended September 30, Nine Months Ended September 30, Revenue 2021 2020 2021 2020 Automotive Segment Automotive Mirrors & Electronics $ 360,415,449 $ 427,426,159 $ 1,185,997,034 $ 1,039,112,012 HomeLink Modules* 30,922,736 37,247,428 101,581,239 87,485,008 Total Automotive Products $ 391,338,185 $ 464,673,587 $ 1,287,578,273 $ 1,126,597,020 Other Segment Fire Protection Products 5,886,227 6,378,303 18,010,048 17,384,594 Aerospace Products 2,374,332 3,586,694 5,740,288 14,344,252 Total Other $ 8,260,559 $ 9,964,997 $ 23,750,336 $ 31,728,846 *Excludes HomeLink revenue where HomeLink electronics are integrated into interior auto-dimming mirrors.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Future Minimum Lease Payments	Future minimum lease payments for operating leases as of September 30, 2021 were as follows: Year ending December 31, 2021 (excluding the nine months ended September 30, 2021) $ 388,416 2022 1,072,816 2023 548,316 2024 48,833 2025 6,287 Thereafter 127 Total future minimum lease payments 2,064,795 Less imputed interest (10,858) Total $ 2,053,937
Lease Liabilities	Reported as of September 30, 2021 Accrued Liabilities $ 1,247,544 Other Non-Current Liabilities 806,393 Total $ 2,053,937

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the fair values of the assets acquired, and the liabilities assumed, as of the acquisition date of March 3, 2021: Fair Value Current Assets $ 32,000 Personal Property 15,000 In-Process R&D 6,795,461 Trade Names and Trademarks 1,301,542 Deferred Tax Asset 1,049,073 Goodwill 2,848,364 Total Net Assets Acquired $ 12,041,440

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020		Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 03, 2021	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 314,805,654		$ 311,922,787	[1]			$ 314,805,654
Acquisitions							2,848,364
Amortization of intangible assets	5,500,000				$ 5,600,000		16,700,000	$ 16,800,000
Amortization expense, remainder of fiscal year	22,000,000						22,000,000
Amortization expense, year one	22,000,000						22,000,000
Amortization expense, year two	20,000,000						20,000,000
Amortization expense, year three	16,000,000						16,000,000
Amortization expense, year four	12,000,000						$ 12,000,000
HomeLink®
Finite-Lived Intangible Assets [Line Items]
Goodwill										$ 307,400,000
Vaporsens Inc
Finite-Lived Intangible Assets [Line Items]
Acquisitions						$ 3,700,000
Argil, Inc.
Finite-Lived Intangible Assets [Line Items]
Acquisitions			$ 900,000
Goodwill, period increase (decrease)	(100,000)
Air-CraftGlass
Finite-Lived Intangible Assets [Line Items]
Goodwill, period increase (decrease)	$ 200,000
Guardian Optical Technologies
Finite-Lived Intangible Assets [Line Items]
Goodwill									$ 2,848,364
Acquisitions		$ 2,800,000
[1]	The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details)	9 Months Ended
	Sep. 30, 2021USD ($)
Goodwill [Roll Forward]
Balance as of December 31, 2020	$ 311,922,787	[1]
Acquisitions	2,848,364
Divestitures	0
Impairments	0
Other (Net Measurement Period Adjustments)	34,503
Balance as of September 30, 2021	$ 314,805,654
[1]	The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, accumulated amortization	$ (154,400,000)	$ (139,925,000)
Intangible assets, gross	397,563,539	389,673,127
Intangible assets, net	243,163,539	249,748,127	[1]
Patents and Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, accumulated amortization	(180,321,666)	(164,492,709)
Intangible assets, gross	437,034,283	428,599,404
Intangible assets, net	256,712,617	264,106,695
Gentex Patents
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	39,124,090	38,625,292
Finite-lived intangible assets, accumulated amortization	(25,858,926)	(24,528,853)
Finite-lived intangible assets, net	13,265,164	14,096,439
Vaporsens Technology Licenses
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	346,654	300,985
Finite-lived intangible assets, accumulated amortization	(62,740)	(38,856)
Finite-lived intangible assets, net	283,914	262,129
HomeLink® Technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	180,000,000	180,000,000
Finite-lived intangible assets, accumulated amortization	(120,000,000)	(108,750,000)
Finite-lived intangible assets, net	$ 60,000,000	$ 71,250,000
Finite-lived intangible asset, useful life	12 years	12 years
Existing Customer Platforms
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 43,000,000	$ 43,000,000
Finite-lived intangible assets, accumulated amortization	(34,400,000)	(31,175,000)
Finite-lived intangible assets, net	$ 8,600,000	$ 11,825,000
Finite-lived intangible asset, useful life	10 years	10 years
HomeLink® Trade Names and Trademarks
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 52,000,000	$ 52,000,000
Exclusive Licensing Agreement
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	96,000,000	96,000,000
In-Process R&D | Vaporsens Inc
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	11,000,000	11,000,000
In-Process R&D | Argil, Inc.
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	6,278,132	6,278,132
In-Process R&D | Air-CraftGlass
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	800,000	$ 1,394,995
In-Process R&D | Guardian Optical Technologies
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 8,485,407
[1]	The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Technology investments	$ 14,000,000	$ 4,000,000
Equity investment losses were considered to be other than temporary	$ 0	$ 0

Investments (Schedule of Assets

Investments (Schedule of Assets or Liabilities, Recurring Fair Value Measurements) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & Cash Equivalents	$ 269,965,105	$ 423,371,036
Market Value	197,559,735	185,166,292
Total	467,524,840	608,537,328
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & Cash Equivalents	269,965,105	423,371,036
Total	275,607,779	430,062,110
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & Cash Equivalents	0	0
Total	191,917,061	178,475,218
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash & Cash Equivalents	0	0
Total	0	0
Short-Term Investments | Certificate of Deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	1,765,030	1,516,693
Short-Term Investments | Certificate of Deposit | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	1,765,030	1,516,693
Short-Term Investments | Certificate of Deposit | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Short-Term Investments | Certificate of Deposit | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Short-Term Investments | Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	2,032,660	7,155,600
Short-Term Investments | Corporate Bonds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Short-Term Investments | Corporate Bonds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	2,032,660	7,155,600
Short-Term Investments | Corporate Bonds | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Short-Term Investments | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value		6,678,450
Short-Term Investments | Government Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value		0
Short-Term Investments | Government Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value		6,678,450
Short-Term Investments | Government Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value		0
Short-Term Investments | Municipal Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	1,334,868	10,284,765
Short-Term Investments | Municipal Bonds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Short-Term Investments | Municipal Bonds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	1,334,868	10,284,765
Short-Term Investments | Municipal Bonds | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Short-Term Investments | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	1,803,989	1,528,861
Short-Term Investments | Other | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	1,803,989	1,528,861
Short-Term Investments | Other | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Short-Term Investments | Other | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Long-Term Investments | Asset Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	27,739,691	37,924,537
Long-Term Investments | Asset Backed Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Long-Term Investments | Asset Backed Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	27,739,691	37,924,537
Long-Term Investments | Asset Backed Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Long-Term Investments | Certificate of Deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	2,073,655	3,645,520
Long-Term Investments | Certificate of Deposit | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	2,073,655	3,645,520
Long-Term Investments | Certificate of Deposit | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0
Long-Term Investments | Certificate of Deposit | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Long-Term Investments | Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	32,845,042	9,024,035
Long-Term Investments | Corporate Bonds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Long-Term Investments | Corporate Bonds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	32,845,042	9,024,035
Long-Term Investments | Corporate Bonds | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Long-Term Investments | Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	39,596,133
Long-Term Investments | Government Securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0
Long-Term Investments | Government Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	39,596,133
Long-Term Investments | Government Securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0
Long-Term Investments | Municipal Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	88,368,667	107,407,831
Long-Term Investments | Municipal Bonds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	0	0
Long-Term Investments | Municipal Bonds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	88,368,667	107,407,831
Long-Term Investments | Municipal Bonds | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market Value	$ 0	$ 0

Investments (Schedule of Amorti

Investments (Schedule of Amortized Cost, Unrealized Gains and Losses, and Market Value of Investment Securities) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Cost	$ 194,091,465	$ 177,467,550
Unrealized Gains	4,526,340	8,260,042
Unrealized Losses	(1,058,070)	(561,300)
Market Value	197,559,735	185,166,292
Short-Term Investments | Certificate of Deposit
Debt Securities, Available-for-sale [Line Items]
Cost	1,750,589	1,502,187
Unrealized Gains	14,441	14,506
Unrealized Losses	0	0
Market Value	1,765,030	1,516,693
Short-Term Investments | Corporate Bonds
Debt Securities, Available-for-sale [Line Items]
Cost	1,992,456	7,084,638
Unrealized Gains	40,204	70,962
Unrealized Losses	0	0
Market Value	2,032,660	7,155,600
Short-Term Investments | Government Securities
Debt Securities, Available-for-sale [Line Items]
Cost		6,635,132
Unrealized Gains		43,318
Unrealized Losses		0
Market Value		6,678,450
Short-Term Investments | Municipal Bonds
Debt Securities, Available-for-sale [Line Items]
Cost	1,334,020	10,160,376
Unrealized Gains	848	124,389
Unrealized Losses	0	0
Market Value	1,334,868	10,284,765
Short-Term Investments | Other
Debt Securities, Available-for-sale [Line Items]
Cost	1,803,989	1,528,861
Unrealized Gains	0	0
Unrealized Losses	0	0
Market Value	1,803,989	1,528,861
Long-Term Investments | Asset Backed Securities
Debt Securities, Available-for-sale [Line Items]
Cost	28,223,803	37,681,113
Unrealized Gains	80,480	800,802
Unrealized Losses	(564,592)	(557,378)
Market Value	27,739,691	37,924,537
Long-Term Investments | Certificate of Deposit
Debt Securities, Available-for-sale [Line Items]
Cost	2,002,082	3,503,898
Unrealized Gains	71,573	141,622
Unrealized Losses	0	0
Market Value	2,073,655	3,645,520
Long-Term Investments | Corporate Bonds
Debt Securities, Available-for-sale [Line Items]
Cost	32,791,105	8,595,020
Unrealized Gains	300,347	429,015
Unrealized Losses	(246,410)	0
Market Value	32,845,042	9,024,035
Long-Term Investments | Government Securities
Debt Securities, Available-for-sale [Line Items]
Cost	39,704,080
Unrealized Gains	9,126
Unrealized Losses	(117,073)
Market Value	39,596,133
Long-Term Investments | Municipal Bonds
Debt Securities, Available-for-sale [Line Items]
Cost	84,489,341	100,776,325
Unrealized Gains	4,009,321	6,635,428
Unrealized Losses	(129,995)	(3,922)
Market Value	$ 88,368,667	$ 107,407,831

Investments (Schedule of Unreal

Investments (Schedule of Unrealized Loss on Investments) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Investments [Abstract]
Aggregate Unrealized Losses, Loss duration less than one year	$ 496,385	$ 561,300
Aggregate Unrealized Losses, Loss duration greater than one year	561,685	0
Aggregate Unrealized Losses, Total	1,058,070	561,300
Aggregate Fair Value of Investments, Loss duration less than one year	63,013,355	12,317,187
Aggregate Fair Value of Investments, Loss duration greater than one year	7,864,526	0
Aggregate Fair Value of Investments, Total	$ 70,877,881	$ 12,317,187

Investments (Investments Classi

Investments (Investments Classified by Contractual Maturity Date) (Details) - Fixed Income Securities	Sep. 30, 2021USD ($)
Debt Securities, Available-for-sale [Line Items]
Due within one year	$ 5,132,558
Due between one and five years	61,209,692
Due over five years	129,413,495
Total	$ 195,755,745

Inventories (Schedule of Invent

Inventories (Schedule of Inventories) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 209,029,089	$ 151,688,455
Work-in-process	33,882,944	32,791,675
Finished goods	49,687,848	41,811,713
Total Inventory	$ 292,599,881	$ 226,291,843	[1]
[1]	The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

Earnings Per Share (Schedule of

Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic Earnings Per Share
Net income		$ 76,660,548	$ 117,092,602	$ 276,617,836	$ 204,224,370
Less: Dividends and undistributed earnings allocated to participating securities		1,240,581	1,697,281	4,240,503	2,906,048
Net Income available to common shareholders		$ 75,419,967	$ 115,395,321	$ 272,377,333	$ 201,318,322
Basic weighted average shares outstanding		234,005,573	241,898,117	236,628,999	243,240,699
Net income per share - Basic (in dollars per share)	[1]	$ 0.32	$ 0.48	$ 1.15	$ 0.83
Diluted Earnings Per Share
Allocation of Net Income used in basic computation		$ 75,419,967	$ 115,395,321	$ 272,377,333	$ 201,318,322
Reallocation of undistributed earnings		2,943	4,742	13,289	6,731
Net Income available to common shareholders - Diluted		$ 75,422,910	$ 115,400,063	$ 272,390,622	$ 201,325,053
Number of shares used in basic computation		234,005,573	241,898,117	236,628,999	243,240,699
Additional weighted average dilutive common stock equivalents (in shares)		897,636	918,950	1,108,216	1,026,916
Diluted weighted average shares outstanding		234,903,209	242,817,067	237,737,215	244,267,615
Net Income per share - Diluted (in dollars per share)	[1]	$ 0.32	$ 0.48	$ 1.15	$ 0.82
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive		987,757	412,775	180,669	412,775
[1]	(1) Earnings Per Share has been adjusted to exclude the portion of net income allocated to participating securities as a result of share-based payment awards.

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans (Narrative) (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2021USD ($)planshares	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Sep. 30, 2021USD ($)planshares	Sep. 30, 2020USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for share-based payments	$ 7,492,763	$ 6,904,725		$ 20,114,921	$ 22,865,087
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under the Omnibus plan | shares				1,463,744
Number of shares authorized | shares	2,000,000			2,000,000
ESPP discount rate				85.00%
ESPP discount rate recognized as compensation expense				15.00%
Employee Severance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for share-based payments			$ 4,173,710
Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grants in period (in shares) | shares				6,156,962
Shares issued under the Omnibus plan | shares				15,031,810
Number of shares authorized | shares	45,000,000			45,000,000
Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 9,556,647			$ 9,556,647
Employee Stock Option Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting period				1 year
Option expiration period				5 years
Employee Stock Option Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting period				5 years
Option expiration period				10 years
Restricted Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	48,175,427			$ 48,175,427
Restricted period, maximum				10 years
Amortization expense	$ 5,215,981	4,366,025		$ 13,978,358	16,271,774
Restricted Stock Plan | Employee Severance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortization expense			$ 4,148,477
Equity Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans | plan	2			2
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 7,967,733			$ 7,967,733
Amortization expense	$ 581,830	$ 1,403,799		$ 1,387,584	$ 2,361,359

Stock-Based Compensation Plan_3

Stock-Based Compensation Plans (Shares Issued Net of Shares Canceled/Expired) (Details) - Omnibus Incentive Plan	9 Months Ended
	Sep. 30, 2021shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grants in period (in shares)	6,156,962
Shares issued under the Omnibus plan	15,031,810
Non-Qualified Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	3,256,685
Conversion rate, options	100.00%
Shares issued under the Omnibus plan	3,256,685
Restricted Stock and Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	2,900,277
Conversion rate, shares	406.00%
Shares issued under the Omnibus plan	11,775,125

Stock-Based Compensation Plan_4

Stock-Based Compensation Plans (Weighted-Average Assumptions for the ESOP) (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Dividend yield	1.83%	1.98%	1.86%	1.99%
Expected volatility	27.47%	27.72%	27.67%	27.38%
Risk-free interest rate	0.98%	0.28%	0.92%	0.31%
Expected term of options	4 years 1 month 20 days	4 years 1 month 28 days	4 years 1 month 24 days	4 years 1 month 28 days
Weighted average grant-date fair value (in dollars per share)	$ 6.32	$ 4.64	$ 6.49	$ 4.38

Comprehensive Income (AOCI Roll

Comprehensive Income (AOCI Rollforward) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020	Dec. 31, 2020	[1]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,916,318,989	$ 1,822,607,413	$ 1,963,943,128	[1]	$ 1,938,087,820
Net current-period change	(994,438)	1,707,816	(3,580,452)		5,736,163
Balance at end of period	1,887,630,286	1,895,612,299	1,887,630,286		1,895,612,299
Accumulated other comprehensive income, end of period	3,270,600		3,270,600			$ 6,851,052
Accumulated  Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	4,265,038	2,739,244	6,851,052		(1,289,103)
Net current-period change	(994,438)	1,707,816	(3,580,452)		5,736,163
Balance at end of period	3,270,600	4,447,060	3,270,600		4,447,060
Accumulated other comprehensive income, end of period	3,270,600	4,447,060	3,270,600		4,447,060
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	879,832	(2,940,052)	769,045		(2,384,589)
Other Comprehensive income (loss) before reclassifications	(349,165)	1,823,667	(238,378)		1,268,204
Net current-period change	(349,165)	1,823,667	(238,378)		1,268,204
Balance at end of period	530,667	(1,116,385)	530,667		(1,116,385)
Unrealized gains (losses) on available-for-sale debt securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	3,385,206	5,679,296	6,082,007		1,095,486
Other Comprehensive income (loss) before reclassifications	(645,273)	208,503	(2,727,750)		5,543,455
Amounts reclassified from accumulated other comprehensive income	0	(324,354)	(614,324)		(1,075,496)
Net current-period change	(645,273)	(115,851)	(3,342,074)		4,467,959
Balance at end of period	$ 2,739,933	$ 5,563,445	$ 2,739,933		$ 5,563,445
[1]	The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

Comprehensive Income (Reclassif

Comprehensive Income (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	$ (13,233,686)	$ (25,804,396)	$ (50,358,854)	$ (42,075,250)
Unrealized gains (losses) on available-for-sale debt securities
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Total net reclassifications for the period	0	324,354	614,324	1,075,496
Amounts Reclassified from Other Comprehensive Income | Unrealized gains (losses) on available-for-sale debt securities
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Realized gain on sale of securities	0	410,575	777,625	1,361,387
Provision for income taxes	0	(86,221)	(163,301)	(285,891)
Total net reclassifications for the period	$ 0	$ 324,354	$ 614,324	$ 1,075,496

Debt and Financing Arrangemen_2

Debt and Financing Arrangements (Details) - USD ($)	Sep. 30, 2021	Oct. 15, 2018
Revolving Facility
Debt Instrument [Line Items]
Principal amount		$ 150,000,000
Long-term debt	$ 0
Credit Agreement
Debt Instrument [Line Items]
Additional borrowings available		100,000,000
Swing Loans
Debt Instrument [Line Items]
Additional borrowings available		20,000,000
Letter of Credit
Debt Instrument [Line Items]
Additional borrowings available		$ 20,000,000

Equity (Details)

Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Oct. 21, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Class of Stock [Line Items]
Stock repurchased (in shares)				9
Common stock issued under stock compensation plan (in shares)				1.8
Net decrease in period (in shares)				7.2
Dividends declared (in dollars per share)		$ 0.120	$ 0.12	$ 0.360	$ 0.36
Subsequent Event
Class of Stock [Line Items]
Dividends declared	$ 28.4

Segment Reporting (Schedule of

Segment Reporting (Schedule of Automotive and Other Segment Reporting) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 399,598,744	$ 474,638,584	$ 1,311,328,609	$ 1,158,325,866
Income (loss) from operations	88,164,940	138,852,889	321,823,263	237,141,800
Automotive Products
Segment Reporting Information [Line Items]
Revenue	391,338,185	464,673,587	1,287,578,273	1,126,597,020
Income (loss) from operations	89,121,170	138,428,628	325,579,533	233,149,936
Other
Segment Reporting Information [Line Items]
Revenue	8,260,559	9,964,997	23,750,336	31,728,846
Income (loss) from operations	$ (956,230)	$ 424,261	$ (3,756,270)	$ 3,991,864

Income Taxes (Details)

Income Taxes (Details)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate	15.40%	17.10%

Revenue (Details)

Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 399,598,744	$ 474,638,584	$ 1,311,328,609	$ 1,158,325,866
Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue	391,338,185	464,673,587	1,287,578,273	1,126,597,020
Other Segment
Disaggregation of Revenue [Line Items]
Revenue	8,260,559	9,964,997	23,750,336	31,728,846
Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	391,338,185	464,673,587	1,287,578,273	1,126,597,020
Automotive Mirrors & Electronics | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue	360,415,449	427,426,159	1,185,997,034	1,039,112,012
HomeLink Modules | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue	30,922,736	37,247,428	101,581,239	87,485,008
Fire Protection Products | Other Segment
Disaggregation of Revenue [Line Items]
Revenue	5,886,227	6,378,303	18,010,048	17,384,594
Aerospace Products | Other Segment
Disaggregation of Revenue [Line Items]
Revenue	2,374,332	3,586,694	5,740,288	14,344,252
U.S. | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	128,570,314	156,521,110	410,852,689	347,952,489
U.S. | Other Products
Disaggregation of Revenue [Line Items]
Revenue	8,260,559	9,964,997	23,750,336	31,728,846
Germany | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	55,162,289	56,514,969	183,513,145	153,166,702
Japan | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	53,750,242	64,353,263	161,814,352	152,824,143
Mexico | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	25,239,690	33,342,171	85,574,821	92,882,253
Other | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	$ 128,615,650	$ 153,942,074	$ 445,823,266	$ 379,771,433

Leases (Details)

Leases (Details)	Sep. 30, 2021USD ($)
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term	2 years
Weighted average discount rate	1.10%
2021 (excluding the nine months ended September 30, 2021)	$ 388,416
2022	1,072,816
2023	548,316
2024	48,833
2025	6,287
Thereafter	127
Total future minimum lease payments	2,064,795
Less imputed interest	(10,858)
Total	2,053,937
Accrued Liabilities	1,247,544
Other Non-Current Liabilities	$ 806,393
Operating lease, liability, current, statement of financial position	Accrued liabilities
Operating lease, liability, noncurrent, statement of financial position	OTHER NON-CURRENT LIABILITIES
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms	5 years

Acquisitions (Details)

Acquisitions (Details) - USD ($)	Dec. 14, 2020	Sep. 18, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 03, 2021
Business Acquisition [Line Items]
Revenue			$ 399,598,744	$ 474,638,584	$ 1,311,328,609	$ 1,158,325,866
Selling, General and Administrative Expenses
Business Acquisition [Line Items]
Acquisition-related costs			$ 375,000		$ 375,000
Argil, Inc.
Business Acquisition [Line Items]
Initial investment in Argil	$ 4,200,000
Air-CraftGlass
Business Acquisition [Line Items]
Purchase price of acquisition		$ 1,100,000
Ownership percentage of business acquisition			100.00%		100.00%
Revenue					$ 0
Argil, Inc.
Business Acquisition [Line Items]
Purchase price of acquisition	$ 3,700,000
Ownership percentage of business acquisition			100.00%		100.00%
Revenue					$ 0
Guardian Optical Technologies
Business Acquisition [Line Items]
Ownership percentage of business acquisition			100.00%		100.00%
Revenue					$ 0
Business acquisition agreement, value							$ 12,000,000

Acquisitions - Schedule of Asse

Acquisitions - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($)	Sep. 30, 2021	Mar. 03, 2021	Dec. 31, 2020	[1]
Business Acquisition [Line Items]
Goodwill	$ 314,805,654		$ 311,922,787
Guardian Optical Technologies
Business Acquisition [Line Items]
Current Assets		$ 32,000
Personal Property		15,000
Deferred Tax Asset		1,049,073
Goodwill		2,848,364
Total Net Assets Acquired		12,041,440
Guardian Optical Technologies | Trade Names and Trademarks
Business Acquisition [Line Items]
Trade Names and Trademarks		1,301,542
Guardian Optical Technologies | In-Process R&D
Business Acquisition [Line Items]
In-Process R&D		$ 6,795,461
[1]	The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.