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Note 7 - Investments (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Marketable Securities [Table Text Block] |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  |  |  |
|  | Cost Basis |  |  | Gains |  |  | Losses |  |  | Fair Value |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 596 |  |  | $ | - |  |  | $ | — |  |  | $ | 596 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government |  | $ | 18,991 |  |  | $ | — |  |  | $ | (76 | ) |  | $ | 18,915 |
Corporate bonds |  |  | 6,548 |  |  |  | — |  |  |  | (63 | ) |  |  | 6,485 |
Commercial paper |  |  | 2,014 |  |  |  | — |  |  |  | (3 | ) |  |  | 2,011 |
Certificates of deposit |  |  | 7,745 |  |  |  | 1 |  |  |  | (13 | ) |  |  | 7,733 |
Total marketable securities |  | $ | 35,298 |  |  | $ | 1 |  |  | $ | (155 | ) |  | $ | 35,144 |
Total assets at fair value |  | $ | 35,894 |  |  | $ | 1 |  |  | $ | (155 | ) |  | $ | 35,740 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2023 |  |  | 2022 |
Maturities within one year |  | $ | 27,770 |  |  | $ | 44,556 |
Maturities after one year through three years |  |  | 7,970 |  |  |  | — |
Total investments |  | $ | 35,740 |  |  | $ | 44,556 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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