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v3.23.2

Note 4 - Cash, Cash Equivalents and Marketable Securities (10Q) (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Notes Tables |  |
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | March 31, 2023 |  |  | December 31, 2022 |
Cash in banking institutions |  | $ | 631,002 |  |  | $ | 1,586,920 |
Money market funds |  |  | 14,014,584 |  |  |  | 8,526,786 |
Total |  | $ | 14,645,586 |  |  | $ | 10,113,706 |
|  | December 31, |
|  | 2022 |  |  | 2021 |
Cash in banking institutions |  | $ | 1,586,920 |  |  | $ | 30,308,075 |
Money market funds |  |  | 8,526,786 |  |  |  | 7,005,483 |
Total |  | $ | 10,113,706 |  |  | $ | 37,313,558 |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | Amortized cost |  |  | Unrealized gains |  |  | Unrealized losses |  |  | Fair Value |
March 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 1,995,318 |  |  |  | 210 |  |  | $ | (1,437 | ) |  | $ | 1,994,091 |
U.S. treasury bonds |  |  | 999,575 |  |  |  | — |  |  |  | (1,896 | ) |  |  | 997,679 |
Total |  | $ | 2,994,893 |  |  |  | 210 |  |  | $ | (3,333 | ) |  | $ | 2,991,770 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | 9,445,220 |  |  |  | 263 |  |  | $ | (21,313 | ) |  | $ | 9,424,170 |
U.S. treasury bonds |  |  | 2,999,095 |  |  |  | — |  |  |  | (14,325 | ) |  |  | 2,984,770 |
Total |  | $ | 12,444,315 |  |  |  | 263 |  |  | $ | (35,638 | ) |  | $ | 12,408,940 |
|  | Amortized cost |  |  | Unrealized gains |  |  | Unrealized losses |  |  | Fair Value |
Commercial paper |  | $ | 9,445,220 |  |  | $ | 263 |  |  | $ | (21,313 | ) |  | $ | 9,424,170 |
U.S. treasury bonds |  |  | 2,999,095 |  |  |  | — |  |  |  | (14,325 | ) |  |  | 2,984,770 |
Total |  | $ | 12,444,315 |  |  | $ | 263 |  |  | $ | (35,638 | ) |  | $ | 12,408,940 |

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