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CONDENSED STATEMENTS OF CASH FLOWS - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Cash flows from operating activities |  |
Net income | $ 28,618,009 | $ 4,088,886
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 429,709 | 419,488
Net unrealized (gain) loss on investments | (1,189,724) | (870,760)
Accreted interest | 58,160 |
Deferred taxes | (6,615,764) | (1,801,996)
Provision for doubtful accounts | 146,395 | 125,000
Share-based compensation | 1,345,915 |
Gain on forgiveness of PPP loan | (1,377,652) |
(Increase) decrease in operating assets: |  |
Accounts receivable | (5,209,061) | (2,021,098)
Inventories | (344,617) | (1,945,014)
Other current assets | 10,731 | 10,917
Other assets | 25,806 | 41,049
Increase (decrease) in operating liabilities: |  |
Accounts payable | 13,993,219 | 2,182,838
Accrued liabilities | 1,465,375 | (87,702)
Income taxes payable | 156,263 | 69,989
Net cash provided by operating activities | 31,512,764 | 211,597
Cash flows from investing activities |  |
Purchase of property, plant, and equipment | (38,151,235) | (374,128)
Purchase of debt and equity securities | (4,631,475) | (2,118,410)
Net cash used by investing activities | (42,782,710) | (2,492,538)
Cash flows from financing activities |  |
Repayments of long-term debt | (136,790) | (128,797)
Proceeds of long-term debt |  | 1,363,000
Proceeds from TIA | 17,676,051 |
Proceeds from the exercise of stock options | 48,600 | 626,687
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 | (88,141) | (109,600)
Repurchase of common stock | (154,424) |
Net cash provided (used) by financing activities | 16,142,936 | 1,651,290
Net increase in cash and cash equivalents | 4,872,990 | (629,651)
Cash and cash equivalents at: |  |
Beginning of period | 17,566,682 | 5,934,749
End of period | 22,439,672 | 5,305,098
Supplemental schedule of cash flow information: |  |
Interest paid | 61,620 | 103,687
Income taxes paid | 16,122,340 |
Supplemental schedule of noncash investing and financing activities: |  |
Preferred dividends declared, not paid | 5,056,946 | $ 54,800
Conversion of preferred stock to common stock | 26,500 |
Amounts receivable under TIA | $ 10,324,812 |

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