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Note 9 - Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Marketable Securities [Table Text Block] |
|  | As of December 31, 2022 |  |  | As of December 31, 2021 |
Marketable securities: |  |  |  |  |  |  |  |
Amortized cost |  | $ | 87,411 |  |  | $ | 114,159 |
Unrealized gains, net |  |  | 510,321 |  |  |  | 1,097,580 |
Total fair value |  | $ | 597,732 |  |  | $ | 1,211,739 |
Gain (Loss) on Securities [Table Text Block] |
|  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
(Loss)/gain on marketable securities, net |  | $ | (315,508 | ) |  | $ | 505,163 |  |  | $ | 594,753 |
Dividend income (included in Other income, net) |  |  | 18,002 |  |  |  | 16,958 |  |  |  | 4,096 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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