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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

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