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Note 4 - Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Debt Securities, Available-for-sale [Table Text Block] |
|  |  | September 30, 2021 |  |  | December 31, 2020 |
| Fair Value Level1 |  | Adjusted Cost |  |  | Gross Unrealized Gains (Losses) |  |  | Fair Value |  |  | Adjusted Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds | Level 1 |  | $ | 37,534 |  |  | $ | — |  |  | $ | 37,534 |  |  | $ | 21,042 |  |  | $ | — |  |  | $ | 21,042 |
Time deposits | Level 2 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,458 |  |  |  | — |  |  |  | 5,458 |
Government and municipal debt securities | Level 2 |  |  | 11,849 |  |  |  | (1 | ) |  |  | 11,848 |  |  |  | 30,280 |  |  |  | (5 | ) |  |  | 30,275 |
Corporate debt securities | Level 2 |  |  | 17,159 |  |  |  | 8 |  |  |  | 17,167 |  |  |  | 11,621 |  |  |  | (6 | ) |  |  | 11,615 |
Total investments |  | $ | 66,542 |  |  | $ | 7 |  |  | $ | 66,549 |  |  | $ | 68,401 |  |  | $ | (11 | ) |  | $ | 68,390 |

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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 http://asc.fasb.org/topic&trid=2196928 + Details
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