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Note 3 - Cash, Cash Equivalents, and Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2024
Notes Tables |
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | March 31, 2024 |
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Cash equivalents (contractual maturity within 90 days): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 12,192 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 12,191 |
Money market funds |  |  | 5,660 |  |  |  | — |  |  |  | — |  |  |  | 5,660 |
Total cash equivalents |  |  | 17,852 |  |  |  | — |  |  |  | (1 | ) |  |  | 17,851 |
Cash |  |  | 3,881 |  |  |  | — |  |  |  | — |  |  |  | 3,881 |
Total cash and cash equivalents |  | $ | 21,733 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 21,732 |
Marketable securities (contractual maturity greater than 90 days but less than 1 year): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 6,179 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 6,178 |
Total marketable securities |  | $ | 6,179 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 6,178 |
|  | December 31, 2023 |
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Cash equivalents (contractual maturity within 90 days): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 19,883 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 19,884 |
Money market funds |  |  | 5,113 |  |  |  | — |  |  |  | — |  |  |  | 5,113 |
Total cash equivalents |  |  | 24,996 |  |  |  | 1 |  |  |  | — |  |  |  | 24,997 |
Cash |  |  | 3,824 |  |  |  | — |  |  |  | — |  |  |  | 3,824 |
Total cash and cash equivalents |  | $ | 28,820 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 28,821 |
Marketable securities (contractual maturity greater than 90 days but less than 1 year): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 6,179 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,179 |
Total marketable securities |  | $ | 6,179 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,179 |

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