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Note 6 - Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Marketable Securities [Table Text Block] |
|  | As of June 30, 2020 |  |  | As of December 31, 2019 |
Marketable securities: |  |  |  |  |  |  |  |
Amortized cost (1) |  | $ | 114,587 |  |  | $ | 12,064 |
Unrealized gains/(losses), net (1) |  |  | 518,964 |  |  |  | (2,711 | )
Total fair value |  | $ | 633,551 |  |  | $ | 9,353 |

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