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Note 4 - Cash, Cash Equivalents and Marketable Securities - Marketable Securities (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized cost | $ 12,444,315 |
Unrealized gains | 263 |
Unrealized losses | (35,638) |
Fair Value | 12,408,940 | $ 0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Amortized cost | 9,445,220 |
Unrealized gains | 263 |
Unrealized losses | (21,313) |
Fair Value | 9,424,170 |
US Treasury Securities [Member] |  |
Amortized cost | 2,999,095 |
Unrealized gains | 0 |
Unrealized losses | (14,325) |
Fair Value | $ 2,984,770 |

X
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