UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 316,820,194	$ 311,459,076
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	70,887,294	71,001,177
(Gain) on disposal of assets	(1,279,049)	(271,510)
Loss on disposal of assets	48,618	250,435
(Gain) on sale of investments and technology investment income	(4,736,312)	(2,747,586)
Loss on sale of investments and technology investment losses	14,839,974	6,840,692
Deferred tax expense	(9,970,207)	(11,870,944)
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock	30,936,895	29,212,236
Change in operating assets and liabilities:
Accounts receivable, net	(34,528,140)	(74,648,395)
Inventories	(46,837,992)	8,907,490
Prepaid expenses and other	(2,616,370)	(5,416,624)
Accounts payable	(8,976,998)	27,451,773
Accrued liabilities, excluding dividends declared	19,229,845	7,500,486
Net cash provided by operating activities	343,817,752	367,668,306
Activity in investments:
Sales proceeds	35,059,971	32,839,883
Maturities and calls	10,260,000	14,435,000
Purchases	(83,764,695)	(112,608,739)
Plant and equipment additions	(102,966,564)	(121,393,801)
Proceeds from sale of plant and equipment	142,400	185,610
Increase in other assets	(5,614,129)	(2,533,687)
Net cash used for investing activities	(146,883,017)	(189,075,734)
CASH FLOWS USED FOR FINANCING ACTIVITIES:
Issuance of common stock from stock plan transactions	24,024,353	24,304,861
Cash dividends paid	(83,145,216)	(84,159,105)
Repurchases of common stock	(184,609,148)	(76,859,341)
Net cash used for financing activities	(243,730,011)	(136,713,585)
NET INCREASE IN CASH AND CASH EQUIVALENTS	(46,795,276)	41,878,987
CASH, CASH EQUIVALENTS, and RESTRICTED CASH, beginning of period	226,435,019	218,754,638
CASH, CASH EQUIVALENTS, and RESTRICTED CASH, end of period	179,639,743	260,633,625
Non-cash investing and financing activities:
Change in property and equipment in accounts payable and accrued expenses and other current liabilities	$ (4,115,011)	$ 9,708,125