Summary of Significant Accounting and Reporting Policies (Tables)

12 Months Ended

Dec. 31, 2018

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, 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
Year Ended December 31, 2016:
Allowance for Doubtful Accounts	$	2,663,477	$	—	$	253,947		$	2,917,424

Schedule of Assets or Liabilities Having Recurring Measurements

Assets or liabilities that have recurring fair value measurements are shown below as of December 31, 2018 and December 31, 2017:

			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		—		—
Government Securities	9,176,227		—		9,176,227		—
Mutual Funds	—		—		—		—
Corporate Bonds	6,967,700		—		6,967,700		—
Other	2,219,688		2,219,688		—		—
Long-Term Investments:
Corporate Bonds	60,369,930		—		60,369,930		—
Government Securities	56,483,720		—		56,483,720		—
Municipal Bonds	18,025,432		—		18,025,432		—
Total	$	520,567,359	$	369,544,350	$	151,023,009	$	—

			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, 2017		(Level I)		(Level 2)		(Level 3)
Cash & Cash Equivalents	$	569,734,496	$	569,734,496	$	—	$	—
Short-Term Investments:
Certificate of Deposit	130,000,000		130,000,000		—		—
Government Securities	9,011,130		—		9,011,130		—
Mutual Funds	393,581		—		393,581		—
Corporate Bonds	12,944,999		—		12,944,999		—
Other	188,344		188,344		—		—
Long-Term Investments:	—
Corporate Bonds	3,018,720		—		3,018,720		—
Common Stocks	15,703,371		15,703,371		—		—
Mutual Funds	34,681,337		34,681,337		—		—
Preferred Stock	1,178,991		1,178,991		—		—
Government Securities	—		—		—		—
Total	$	776,854,969	$	751,486,539	$	25,368,430	$	—

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, 2018 and 2017:

	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	—		—		—			—
Government Securities	56,280,552		205,553		(2,385		)	56,483,720
Municipal Bonds	17,840,518		184,914		—			18,025,432
Government Securities	—		—		—			—
Total	$	303,467,531	$	440,807	$	(366,257	)	$	303,542,081

	Unrealized
2017	Cost		Gains		Losses			Market Value
Short-Term Investments:
Certificate of Deposit	$	130,000,000	$	—	$	—		$	130,000,000
Government Securities	9,024,777		—		(13,647		)	9,011,130
Mutual Funds	392,482		1,575		(476		)	393,581
Corporate Bonds	12,952,229		—		(7,230		)	12,944,999
Other	188,344		—		—			188,344
Long-Term Investments:
Corporate Bonds	3,022,994		—		(4,274		)	3,018,720
Common Stocks	10,897,219		5,079,815		(273,663		)	15,703,371
Mutual Funds	29,306,540		5,440,344		(65,547		)	34,681,337
Preferred Stock	1,141,458		40,533		(3,000		)	1,178,991
Total	$	196,926,043	$	10,562,267	$	(367,837	)	$	207,120,473

Schedule of Unrealized Losses on Investments

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

Unrealized losses on investments as of December 31, 2017 are as follows:

	Aggregate Unrealized Losses		Aggregate Fair Value
Less than one year	$	263,655	$	31,223,557
Greater than one year	104,182		285,077
Total	$	367,837	$	31,508,634

Investments Classified by Contractual Maturity Date

Fixed income securities as of December 31, 2018, have contractual maturities as follows:

Due within one year	$	166,443,311
Due between one and five years	113,806,135
Due over five years	21,072,946
	$	301,322,392

Schedule of Inventories

Inventories consisted of the following as of December 31, 2018 and 2017:

	2018		2017
Raw materials	$	139,058,541	$	139,272,129
Work-in-process	35,386,615		30,481,192
Finished goods	50,836,443		47,012,262
Total Inventory	$	225,281,599	$	216,765,583

Schedule of Earnings Per Share Basic and Diluted

The following table reconciles the numerators and denominators used in the calculations of basic and diluted earnings per share (EPS) for each of the last three years:

	2018		2017		2016
Numerators:
Numerator for both basic and diluted EPS, net income	$	437,883,097	$	406,791,922	$	347,591,276
Denominators:
Denominator for basic EPS, weighted-average common shares outstanding	267,794,786		285,864,997		288,433,772
Potentially dilutive shares resulting from stock option plans	2,082,563		2,361,092		2,638,544
Denominator for diluted EPS	269,877,349		288,226,089		291,072,316