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v3.23.2

Note 4 - Cash, Cash Equivalents and Marketable Securities - Marketable Securities (Details) - USD ($) | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Statement [Line Items] |  |  |
Amortized cost | $ 2,994,893 | $ 12,444,315 |
Unrealized gains | 210 | 263 |
Unrealized losses | (3,333) | (35,638) |
Fair Value | 2,991,770 | 12,408,940 | $ 0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |  |
Statement [Line Items] |  |  |
Amortized cost | 1,995,318 | 9,445,220 |
Unrealized gains | 210 | 263 |
Unrealized losses | (1,437) | (21,313) |
Fair Value | 1,994,091 | 9,424,170 |
US Treasury Securities [Member] |  |  |
Statement [Line Items] |  |  |
Amortized cost | 999,575 | 2,999,095 |
Unrealized gains | 0 | 0 |
Unrealized losses | (1,896) | (14,325) |
Fair Value | $ 997,679 | $ 2,984,770 |

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