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Note 2 - Cash, Cash Equivalents, and Investments (Tables) | 9 Months Ended
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Sep. 30, 2024
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | September 30, 2024 (Unaudited) |
|  |  |  |  |  |  |  |  |  | Allowance |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Level |  |  |  |  |  |  | for |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | (1 | ) |  | Credit Losses |  |  | Holding Gains |  |  | Holding Losses |  |  | Adjusted Cost |  |  |  |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  | $ | 1,095,858 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,095,858 |
Money Market Funds (2) |  |  | 1 |  |  |  | 4,825,756 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4,825,756 |
Subtotal |  |  |  |  |  |  | 5,921,614 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,921,614 |
Short-Term Investment Securities (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Bonds (4)(5) |  |  | 2 |  |  |  | 4,002,034 |  |  |  | — |  |  |  | 1,202 |  |  |  | — |  |  |  | 4,000,832 |
Total |  |  |  |  |  | $ | 9,923,648 |  |  | $ | — |  |  | $ | 1,202 |  |  | $ | — |  |  | $ | 9,922,446 |
|  | December 31, 2023 (Audited) |
|  |  |  |  |  |  |  |  | Allowance |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Level |  |  |  |  |  |  | for |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | (1) |  |  | Fair Value |  |  | Credit Losses |  |  | Holding Gains |  |  | Holding Losses |  |  | Adjusted Cost |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | $ | 25,775 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 25,775 |
Money Market Funds (2) |  | 1 |  |  |  | 6,489,253 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,489,253 |
Subtotal |  |  |  |  |  | 6,515,028 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,515,028 |
Short-Term Investment Securities (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Bonds (4)(5) |  | 2 |  |  |  | 748,105 |  |  |  | — |  |  |  | — |  |  |  | (185 | ) |  |  | 748,290 |
Total |  |  |  |  | $ | 7,263,133 |  |  | $ | — |  |  | $ | — |  |  | $ | (185 | ) |  | $ | 7,263,318 |

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