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Note 8 - Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | March 31, 2022 |
(in thousands) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. municipal securities |  | $ | 14,889 |  |  | $ | - |  |  | $ | (264 | ) |  | $ | 14,625 |
Corporate debt securities |  |  | 12,144 |  |  |  | - |  |  |  | (180 | ) |  |  | 11,964 |
U.S. government agency securities |  |  | 17,288 |  |  |  | - |  |  |  | (188 | ) |  |  | 17,100 |
Certificates of deposit/time deposits |  |  | 1,438 |  |  |  | 2 |  |  |  | (2 | ) |  |  | 1,438 |
Commercial paper |  |  | 2,987 |  |  |  | - |  |  |  | (4 | ) |  |  | 2,983 |
Total marketable securities |  | $ | 48,746 |  |  | $ | 2 |  |  | $ | (638 | ) |  | $ | 48,110 |
|  | December 31, 2021 |
(in thousands) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. municipal securities |  | $ | 12,549 |  |  | $ | - |  |  | $ | (70 | ) |  | $ | 12,479 |
Corporate debt securities |  |  | 9,303 |  |  |  | - |  |  |  | (44 | ) |  |  | 9,259 |
U.S. government agency securities |  |  | 2,500 |  |  |  | - |  |  |  | (12 | ) |  |  | 2,488 |
Certificates of deposit/time deposits |  |  | 1,687 |  |  |  | 7 |  |  |  | - |  |  |  | 1,694 |
Commercial paper |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Total marketable securities |  | $ | 26,039 |  |  | $ | 7 |  |  | $ | (126 | ) |  | $ | 25,920 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | March 31, |
(in thousands) |  | 2022 |
Due in one year or less |  | $ | 19,914 |
Due after one year through five years |  |  | 28,196 |
Total marketable securities |  | $ | 48,110 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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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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