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Note 4 - Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  |  | September 30, 2022 |  |  | December 31, 2021 |
| Fair Value Level1 |  | Adjusted Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Adjusted Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds | Level 1 |  | $ | 10,956 |  |  | $ | — |  |  | $ | 10,956 |  |  | $ | 20,711 |  |  | $ | — |  |  | $ | 20,711 |
Government and municipal debt securities | Level 2 |  |  | 10,658 |  |  |  | (2 | ) |  |  | 10,656 |  |  |  | 14,006 |  |  |  | (2 | ) |  |  | 14,004 |
Corporate debt securities | Level 2 |  |  | 37,008 |  |  |  | (37 | ) |  |  | 36,971 |  |  |  | 31,863 |  |  |  | (16 | ) |  |  | 31,847 |
Total investments |  | $ | 58,622 |  |  | $ | (39 | ) |  | $ | 58,583 |  |  | $ | 66,580 |  |  | $ | (18 | ) |  | $ | 66,562 |

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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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