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Note 5 - Fair Value of Financial Instruments (10Q) (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Notes Tables |  |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | Fair value measurement at reporting date |
|  | Quoted prices in active markets for identical assets (Level 1) |  |  | Significant other observable inputs (Level 2) |  |  | Significant unobservable inputs (Level 3) |
March 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 14,014,584 |  |  | $ | — |  |  | $ | — |
Commercial paper |  |  | — |  |  |  | — |  |  |  | — |
Total cash and cash equivalents |  | $ | 14,014,584 |  |  | $ | — |  |  | $ | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | — |  |  |  | 1,994,090 |  |  |  | — |
US treasury |  |  | — |  |  |  | 997,680 |  |  |  | — |
Total marketable securities |  | $ | — |  |  | $ | 2,991,770 |  |  | $ | — |
Total financial assets |  | $ | 14,014,584 |  |  | $ | 2,991,770 |  |  | $ | — |
December 31, 2022: |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 8,526,786 |  |  | $ | — |  |  | $ | — |
Commercial paper |  |  | — |  |  |  | — |  |  |  | — |
Total cash and cash equivalents |  | $ | 8,526,786 |  |  | $ | — |  |  | $ | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | — |  |  |  | 9,424,170 |  |  |  | — |
US treasury |  |  | — |  |  |  | 2,984,770 |  |  |  | — |
Total marketable securities |  | $ | — |  |  | $ | 12,408,940 |  |  | $ | — |
Total financial assets |  | $ | 8,526,786 |  |  | $ | 12,408,940 |  |  | $ | — |
|  | Fair value measurement at reporting date |
|  | Quoted prices in active markets for identical assets (Level 1) |  |  | Significant other observable inputs (Level 2) |  |  | Significant unobservable inputs (Level 3) |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 8,526,786 |  |  | $ | — |  |  | $ | — |
Commercial paper |  |  | — |  |  |  | — |  |  |  | — |
Total cash and cash equivalents |  | $ | 8,526,786 |  |  | $ | — |  |  | $ | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | $ | — |  |  | $ | 9,424,170 |  |  | $ | — |
US treasury |  |  | — |  |  |  | 2,984,770 |  |  |  | — |
Total marketable securities |  | $ | — |  |  | $ | 12,408,940 |  |  | $ | — |
Total financial assets |  | $ | 8,526,786 |  |  | $ | 12,408,940 |  |  | $ | — |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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