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CONDENSED STATEMENTS OF CASH FLOWS - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Cash flows from operating activities |  |
Net income | $ 429,384 | $ 990,972
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 1,889,467 | 1,938,921
Net unrealized gain on investments | (1,732,649) | (1,492,011)
Realized gain on investments |  | (746,262)
Accreted interest |  | 9,157
Bond amortization | (251) |
Deferred taxes | 83,891 | 230,917
Provision for credit losses |  | 370,573
Net realizable value inventory adjustment | 1,845 | 141,518
Other income - TIA | (1,484,620) | (1,557,779)
(Increase) decrease in operating assets: |  |
Accounts receivable | 3,247,092 | (1,849,918)
Inventories | (1,909,296) | (1,556,397)
Other current assets | (51,550) | (533,279)
Income taxes receivable |  | 1,100,847
Other assets | 14,904 | 11,178
Increase (decrease) in operating liabilities: |  |
Accounts payable | (2,184,723) | (1,034,169)
Accrued liabilities | (322,754) | 276,150
Income taxes payable | (3,147) |
Net cash used by operating activities | (2,022,407) | (3,699,582)
Cash flows from investing activities |  |
Purchase of property, plant, and equipment | (226,396) | (467,530)
Purchase of debt and equity securities | (276,326) | (15,918,837)
Proceeds from the sales of debt and equity securities |  | 6,784,228
Net cash used by investing activities | (502,722) | (9,602,139)
Cash flows from financing activities |  |
Repayments of long-term debt | (73,648) | (70,496)
Proceeds from Technology Investment Agreement (TIA) |  | 1,172,310
Payment of preferred stock repurchase payable |  | (1,101,110)
Payment of preferred stock dividends | (57,611) | (58,111)
Net cash used by financing activities | (131,259) | (57,407)
Net decrease in cash and cash equivalents | (2,656,388) | (13,359,128)
Cash and cash equivalents at: |  |
Beginning of period | 12,667,550 | 19,721,345
End of period | 10,011,162 | 6,362,217
Supplemental schedule of cash flow information: |  |
Interest paid | 33,483 | 34,398
Supplemental schedule of noncash investing and financing activities: |  |
Preferred dividends declared, not paid | 57,611 | 1,417,937
Amounts receivable under Technology Investment Agreement (TIA) |  | 1,390,919
Redemption price payable | $ 6,000 | $ 6,000

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