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Note 2 - Cash, Cash Equivalents, and Investments (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | 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 |
|  | December 31, 2021 |
|  |  |  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Level |  |  |  |  |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | (1) |  |  | Fair Value |  |  | Holding Gains |  |  | Holding Losses |  |  | Adjusted Cost |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | $ | 1,377,094 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,377,094 |
Money Market Funds |  | 1 |  |  |  | 14,371,386 |  |  |  | — |  |  |  | — |  |  |  | 14,371,386 |
Subtotal |  |  |  |  |  | 15,748,480 |  |  |  | — |  |  |  | — |  |  |  | 15,748,480 |
Short-Term Investment Securities (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Bonds (3) |  | 2 |  |  |  | 4,509,285 |  |  |  | — |  |  |  | (2,495 | ) |  |  | 4,511,780 |
Total |  |  |  |  | $ | 20,257,765 |  |  | $ | — |  |  | $ | (2,495 | ) |  | $ | 20,260,260 |

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