UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 108,230,714	$ 97,578,261
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,953,768	24,041,648
(Gain) on disposal of assets	(25,671)	(106,743)
Loss on disposal of assets	6,838	41,843
(Gain) on sale of investments and technology investment income	(4,687,471)	(1,199,707)
Loss on sale of investments and technology investment losses	10,384,965	1,671,583
Change in deferred income taxes	(3,638,218)	141,959
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock	10,473,792	8,519,535
Change in operating assets and liabilities:
Accounts receivable, net	(19,781,263)	(56,373,376)
Inventories	(34,064,216)	2,590,294
Prepaid expenses and other	4,663,897	(629,502)
Accounts payable	6,080,702	11,112,425
Accrued liabilities, excluding dividends declared	28,279,293	33,525,890
Net cash provided by operating activities	129,877,130	120,914,110
Activity in investments:
Sales proceeds	16,121,684	3,128,110
Maturities and calls	1,420,000	1,465,000
Purchases	(37,537,250)	(32,178,155)
Plant and equipment additions	(31,871,370)	(42,819,075)
Proceeds from sale of plant and equipment	9,500	118,410
Increase in other assets	(3,285,058)	(2,110,935)
Net cash used for investing activities	(55,142,494)	(72,396,645)
CASH FLOWS USED FOR FINANCING ACTIVITIES:
Issuance of common stock from stock plan transactions	16,833,987	5,956,022
Cash dividends paid	(27,774,268)	(28,099,993)
Repurchases of common stock	(41,224,840)	(25,675,972)
Net cash used for financing activities	(52,165,121)	(47,819,943)
NET INCREASE IN CASH AND CASH EQUIVALENTS	22,569,515	697,522
CASH, CASH EQUIVALENTS, and RESTRICTED CASH, beginning of period	226,435,019	218,754,638
CASH, CASH EQUIVALENTS, and RESTRICTED CASH, end of period	249,004,534	219,452,160
Non-cash investing and financing activities:
Change in property and equipment in accounts payable and accrued expenses and other current liabilities	$ 557,154	$ (1,283,303)