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CONDENSED STATEMENTS OF CASH FLOWS - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Cash flows from operating activities |  |
Net income | $ 35,139,894 | $ 12,714,637
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 702,384 | 624,998
Net unrealized gain on investments | (816,150) | (559,543)
Realized gains on investments |  | (162,595)
Accreted interest | 83,282 |
Deferred taxes | (8,514,068) | (804,357)
Provision for doubtful accounts | 146,395 | 125,000
Share-based compensation | 2,503,152 |
Gain on forgiveness of PPP loan | (1,377,652) |
(Increase) decrease in operating assets: |  |
Accounts receivable | (9,055,116) | (7,542,375)
Inventories | (8,462,118) | (301,951)
Other current assets | (83,512) | (18,053)
Other assets | 38,892 | 10,125
Increase (decrease) in operating liabilities: |  |
Accounts payable | 8,154,409 | 2,272,302
Accrued liabilities | 1,490,008 | 1,803,433
Income taxes payable | (1,820,078) | 670,531
Net cash provided by operating activities | 18,129,722 | 8,832,152
Cash flows from investing activities |  |
Purchase of property, plant, and equipment | (46,511,859) | (9,478,182)
Purchase of debt and equity securities | (4,685,960) | (2,174,980)
Proceeds from the sales of debt and equity securities |  | 3,965,329
Net cash used by investing activities | (51,197,819) | (7,687,833)
Cash flows from financing activities |  |
Repayments of long-term debt | (206,310) | (194,985)
Proceeds of long-term debt |  | 1,363,000
Proceeds from Technology Investment Agreement (TIA) | 39,848,368 | 6,883,103
Proceeds from the exercise of stock options | 48,600 | 851,012
Payment of preferred stock redemption price payable | (101,250) |
Payment of preferred stock repurchase payable | (1,101,110) | (100,000)
Payment of preferred stock dividends | (3,784,394) | (164,400)
Repurchase of common stock | (2,839,326) |
Net cash provided by financing activities | 31,864,578 | 8,637,730
Net increase (decrease) in cash and cash equivalents | (1,203,519) | 9,782,049
Cash and cash equivalents at: |  |
Beginning of period | 17,566,682 | 5,934,749
End of period | 16,363,163 | 15,716,798
Supplemental schedule of cash flow information: |  |
Interest paid | 89,386 | 105,959
Income taxes paid | 21,068,540 |
Supplemental schedule of noncash investing and financing activities: |  |
Preferred dividends declared, not paid | 1,399,744 | 52,242
Conversion of preferred stock to common stock | 26,500 | 15,000
Amounts receivable under Technology Investment Agreement | $ (3,014,325) |
Preferred stock repurchase payable |  | $ 2,723,248

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