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Note 2 - Cash, Cash Equivalents, and Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | December 31, 2023 |
|  |  |  |  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Level |  |  |  |  |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  |  | (1) |  |  | Fair Value |  |  | Holding Gains |  |  | Holding Losses |  |  | Adjusted Cost |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  | $ | 25,775 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,775 |
Money Market Funds |  |  | 1 |  |  |  | 6,489,253 |  |  |  | — |  |  |  | — |  |  |  | 6,489,253 |
Subtotal |  |  |  |  |  |  | 6,515,028 |  |  |  | — |  |  |  | — |  |  |  | 6,515,028 |
Short-Term Investment Securities (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Bonds (3) |  |  | 2 |  |  |  | 748,105 |  |  |  | — |  |  |  | (185 | ) |  |  | 748,290 |
Total |  |  |  |  |  | $ | 7,263,133 |  |  | $ | — |  |  | $ | (185 | ) |  | $ | 7,263,318 |
|  | December 31, 2022 |
|  |  |  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Level |  |  |  |  |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | (1) |  |  | Fair Value |  |  | Holding Gains |  |  | Holding Losses |  |  | Adjusted Cost |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | $ | 26,782 |  |  | $ | — |  |  | $ | — |  |  | $ | 26,782 |
Money Market Funds |  | 1 |  |  |  | 5,767,490 |  |  |  | — |  |  |  | — |  |  |  | 5,767,490 |
Subtotal |  |  |  |  |  | 5,794,272 |  |  |  | — |  |  |  | — |  |  |  | 5,794,272 |
Short-Term Investment Securities (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Bonds (3) |  | 2 |  |  |  | 6,800,062 |  |  |  | — |  |  |  | (47,208 | ) |  |  | 6,847,270 |
Total |  |  |  |  | $ | 12,594,334 |  |  | $ | — |  |  | $ | (47,208 | ) |  | $ | 12,641,542 |

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