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Note 3 - Cash, Cash Equivalents, and Marketable Securities | 3 Months Ended
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Mar. 31, 2024
Notes to Financial Statements |
Cash, Cash Equivalents, and Marketable Securities [Text Block] | Note 3. Cash, Cash Equivalents, and Marketable Securities Available-for-Sale Securities Available-for-sale securities as of March 31, 2024 were as follows:
|  | 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 |
Available-for-sale securities as of December 31, 2023 were as follows:
|  | 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 |
We received proceeds of $6.3 million and $5.0 million from the maturity of marketable securities during the three months ended March 31, 2024 and 2023, respectively. We had no realized gains or losses from the sale of available-for-sale securities during the three months ended March 31, 2024 and 2023. As of March 31, 2024 and December 31, 2023, we did not have any allowance for credit losses or impairments of available-for-sale securities.

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/320/tableOfContent + Details
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