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Note 5 - Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  |  |  | December 31, 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 |  | $ | 2,143 |  |  | $ | — |  |  | $ | 2,143 |  |  | $ | 20,711 |  |  | $ | — |  |  | $ | 20,711 |
Government and municipal debt securities |  | Level 2 |  |  | 6,759 |  |  |  | — |  |  |  | 6,759 |  |  |  | 14,006 |  |  |  | (2 | ) |  |  | 14,004 |
Corporate debt securities |  | Level 2 |  |  | 47,947 |  |  |  | (16 | ) |  |  | 47,931 |  |  |  | 31,863 |  |  |  | (16 | ) |  |  | 31,847 |
Total investments |  |  |  | $ | 56,849 |  |  | $ | (16 | ) |  | $ | 56,833 |  |  | $ | 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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