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Note 2 - Cash, Cash Equivalents, and Investments (Tables) | 3 Months Ended
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Mar. 31, 2024
Notes Tables |
Cash, Cash Equivalents and Investments [Table Text Block] |
|  | March 31, 2024 (Unaudited) |
|  |  |  |  |  |  |  |  |  | Allowance |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Level |  |  |  |  |  |  | for |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | (1) |  |  | Fair Value |  |  | Credit Losses |  |  | Holding Gains |  |  | Holding Losses |  |  | Adjusted Cost |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  | $ | 843,189 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 843,189 |
Money Market Funds (2) |  |  | 1 |  |  |  | 9,726,625 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 9,726,625 |
Subtotal |  |  |  |  |  |  | 10,569,814 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 10,569,814 |
Short-Term Investment Securities (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Bonds (4)(5) |  |  | 2 |  |  |  | 1,467,072 |  |  |  | — |  |  |  | — |  |  |  | (930 | ) |  |  | 1,468,002 |
Total |  |  |  |  |  | $ | 12,036,886 |  |  | $ | — |  |  | $ | — |  |  | $ | (930 | ) |  | $ | 12,037,816 |
|  | 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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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration