Summary of Significant Accounting and Reporting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of Allowance For Doubtful Accounts

The following table presents the activity in the Company’s allowance for doubtful accounts:

	Beginning Balance		Net Additions/ (Reductions) to Costs and Expenses		Deductions and Other Adjustments			Ending Balance
Year Ended December 31, 2019:
Allowance for Doubtful Accounts	$	2,746,647	$	—	$	(295,354	)	$	2,451,293
Year Ended December 31, 2018:
Allowance for Doubtful Accounts	$	2,714,533	$	—	$	32,114		$	2,746,647
Year Ended December 31, 2017:
Allowance for Doubtful Accounts	$	2,917,424	$	—	$	(202,891	)	$	2,714,533

Schedule of Assets or Liabilities Having Recurring Measurements

Assets or liabilities that have recurring fair value measurements are shown below as of December 31, 2019 and December 31, 2018:

			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, 2019		(Level I)		(Level 2)		(Level 3)
Cash & Cash Equivalents	$	296,321,622	$	296,321,622	$	—	$	—
Short-Term Investments:
Certificate of Deposit	50,099,795		50,099,795		—		—
Corporate Bonds	29,219,685		—		29,219,685		—
Government Securities	58,432,823		—		58,432,823		—
Other	2,631,750		2,631,750		—		—
Long-Term Investments:
Asset-backed Securities	25,791,029		—		25,791,029		—
Certificate of Deposit	3,557,798		3,557,798		—		—
Corporate Bonds	22,815,998		—		22,815,998		—
Government Securities	6,088,190		—		6,088,190		—
Municipal Bonds	72,638,690		—		72,638,690		—
Total	$	567,597,380	$	352,610,965	$	214,986,415	$	—

			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, 2018		(Level I)		(Level 2)		(Level 3)
Cash & Cash Equivalents	217,025,278		$	217,025,278	$	—	$	—
Short-Term Investments:
Certificate of Deposit	150,299,384		150,299,384		—		—
Corporate Bonds	6,967,700		—		6,967,700		—
Government Securities	9,176,227		—		9,176,227		—
Other	2,219,688		2,219,688		—		—
Long-Term Investments:
Corporate Bonds	60,369,930		—		60,369,930		—
Municipal Bonds	18,025,432		—		18,025,432		—
Government Securities	56,483,720		—		56,483,720		—
Total	$	520,567,359	$	369,544,350	$	151,023,009	$	—

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 December 31, 2019 and 2018:

	Unrealized
2019	Cost		Gains		Losses			Market Value
Short-Term Investments:
Certificate of Deposit	$	50,099,795	$	—	$	—		$	50,099,795
Corporate Bonds	29,025,624		194,061		—			29,219,685
Government Securities	58,343,911		99,917		(11,005		)	58,432,823
Other	2,631,750		—		—			2,631,750
Long-Term Investments:
Asset-backed Securities	25,971,156		—		(180,127		)	25,791,029
Certificate of Deposit	3,500,000		58,808		(1,010		)	3,557,798
Corporate Bonds	22,306,130		509,868		—			22,815,998
Government Securities	6,012,705		75,485		—			6,088,190
Municipal Bonds	71,997,996		1,036,116		(395,422		)	72,638,690
Total	$	269,889,067	$	1,974,255	$	(587,564	)	$	271,275,758

	Unrealized
2018	Cost		Gains		Losses			Market Value
Short-Term Investments:
Certificate of Deposit	$	150,299,384	$	—	$	—		$	150,299,384
Government Securities	9,186,586		—		(10,359		)	9,176,227
Corporate Bonds	6,981,305		—		(13,605		)	6,967,700
Other	2,219,688		—		—			2,219,688
Long-Term Investments:
Corporate Bonds	60,659,498		50,340		(339,908		)	60,369,930
Common Stocks	—		—		—			—
Municipal Bonds	17,840,518		184,914		—			18,025,432
Government Securities	56,280,552		205,553		(2,385		)	56,483,720
Total	$	303,467,531	$	440,807	$	(366,257	)	$	303,542,081

Schedule of Unrealized Losses on Investments

Unrealized losses on investments as of December 31, 2019 are as follows:

	Aggregate Unrealized Losses		Aggregate Fair Value
Less than one year	$	587,564	$	90,721,081
Greater than one year	—		—
Total	$	587,564	$	90,721,081

Unrealized losses on investments as of December 31, 2018 are as follows:

	Aggregate Unrealized Losses		Aggregate Fair Value
Less than one year	$	365,824	$	68,722,980
Greater than one year	433		3,000,000
Total	$	366,257	$	71,722,980

Investments Classified by Contractual Maturity Date

Fixed income securities as of December 31, 2019, have contractual maturities as follows:

Due within one year	$	137,752,302
Due between one and five years	43,125,222
Due over five years	87,766,483
	$	268,644,007

Schedule of Inventories

Inventories consisted of the following as of December 31, 2019 and 2018:

	2019		2018
Raw materials	$	164,974,553	$	139,058,541
Work-in-process	33,069,255		35,386,615
Finished goods	50,898,047		50,836,443
Total Inventory	$	248,941,855	$	225,281,599

Schedule of Future Minimum Lease Payments

Future minimum lease payments for operating leases as of December 31, 2019 were as follows:

Year ending December 31,
2020	$	786,807
2021	297,316
2022	145,154
2023	19,296
Thereafter	15,105
Total future minimum lease payments	$	1,263,678
Less imputed interest	(84,964		)
Total	$	1,178,714

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 each of the last three years:

	2019		2018		2017
Basic Earnings Per Share
Net Income	$	424,683,939	$	437,883,097	$	406,791,922
Less: Allocated to participating securities(1)	5,028,813		—		—
Net Income available to common shareholders	$	419,655,126	$	437,883,097	$	406,791,922
Basic weighted average shares outstanding	251,766,382		267,794,786		285,864,997
Net Income per share - Basic	$	1.67	$	1.64	$	1.42
Diluted Earnings Per Share
Allocation of Net Income used in basic computation	$	419,655,126	$	437,883,097	$	406,791,922
Reallocation of undistributed earnings	21,104		21,007		19,398
Net Income available to common shareholders - Diluted	$	419,676,230	$	437,904,104	$	406,811,320
Number of shares used in basic computation	251,766,382		267,794,786		285,864,997
Additional weighted average dilutive common stock equivalents	1,506,608		2,082,563		2,361,092
Diluted weighted average shares outstanding	253,272,990		269,877,349		288,226,089
Net income per share - Diluted	$	1.66	$	1.62	$	1.41

⁽¹⁾While there were participating securities in 2018 and 2017, they did not have a material impact on the two-class EPS calculation. Net income allocated to participating securities in 2018 and 2017 was $3,836,536 and $2,562,473, respectively.