UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 194,271,153	$ 206,733,664
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	47,942,132	48,841,936
(Gain) on disposal of assets	(1,261,727)	(214,593)
Loss on disposal of assets	29,782	220,568
(Gain) on sale of investments and technology investment income	(4,708,185)	(2,747,586)
Loss on sale of investments and technology investment losses	29,061,771	4,201,138
Deferred tax expense	(11,232,239)	(5,122,661)
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock	21,396,790	18,264,205
Change in operating assets and liabilities:
Accounts receivable, net	15,244,187	(73,915,719)
Inventories	(61,019,277)	14,334,001
Prepaid expenses and other	(3,559,130)	(2,722,437)
Accounts payable	17,318,424	22,410,431
Accrued liabilities, excluding dividends declared	15,643,764	11,483,186
Net cash provided by operating activities	259,127,445	241,766,133
Activity in investments:
Sales proceeds	19,649,880	21,523,990
Maturities and calls	6,260,000	11,650,000
Purchases	(60,360,047)	(65,945,596)
Plant and equipment additions	(63,634,852)	(90,277,995)
Proceeds from sale of plant and equipment	127,000	140,610
Increase in other assets	(4,120,881)	(3,486,284)
Net cash used for investing activities	(102,078,900)	(126,395,275)
CASH FLOWS USED FOR FINANCING ACTIVITIES:
Issuance of common stock from stock plan transactions	20,242,309	13,882,810
Cash dividends paid	(55,517,709)	(56,146,939)
Repurchases of common stock	(87,966,213)	(54,195,766)
Net cash used for financing activities	(123,241,613)	(96,459,895)
NET INCREASE IN CASH AND CASH EQUIVALENTS	33,806,932	18,910,963
CASH, CASH EQUIVALENTS, and RESTRICTED CASH, beginning of period	226,435,019	218,754,638
CASH, CASH EQUIVALENTS, and RESTRICTED CASH, end of period	260,241,951	237,665,601
Non-cash investing and financing activities:
Change in property and equipment in accounts payable and accrued expenses and other current liabilities	$ (912,142)	$ 5,064,356