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Note 7 - Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | March 31, 2024 (Unaudited) |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 49,434 |  |  | $ | 45 |  |  | $ | (743 | ) |  | $ | 48,736 |
Available-for-sale - matures after one year through three years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 80,935 |  |  |  | 127 |  |  |  | (2,928 | ) |  |  | 78,134 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | $ | 130,369 |  |  | $ | 172 |  |  | $ | (3,671 | ) |  | $ | 126,870 |
|  | December 31, 2023 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 27,690 |  |  | $ | 4 |  |  | $ | (243 | ) |  | $ | 27,451 |
Available-for-sale - matures after one year through three years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 108,700 |  |  |  | 278 |  |  |  | (3,734 | ) |  |  | 105,244 |
Total |  | $ | 136,390 |  |  | $ | 282 |  |  | $ | (3,977 | ) |  | $ | 132,695 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  | Less than 12 months |  |  | 12 months or greater |
|  | Fair value |  |  | Gross unrealized loss |  |  | Fair value |  |  | Gross unrealized loss |
As of March 31, 2024 (unaudited) |  | $ | 23,123 |  |  | $ | (147 | ) |  | $ | 76,036 |  |  | $ | (3,524 | )
As of December 31, 2023 |  | $ | 18,193 |  |  | $ | (49 | ) |  | $ | 86,643 |  |  | $ | (3,928 | )
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Three months ended March 31, |
|  | 2024 |  |  | 2023 |
|  | (unaudited) |  |  | (unaudited) |
Gross realized gains from sale of available-for-sale marketable securities |  | $ | 9 |  |  | $ | 92 |
Gross realized losses from sale of available-for-sale marketable securities |  | $ | (5 | ) |  | $ | — |

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