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Note 7 - Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2024 (Unaudited) |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 51,319 |  |  | $ | 19 |  |  | $ | (673 | ) |  | $ | 50,665 |
Available-for-sale - matures after one year through three years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 83,558 |  |  |  | 91 |  |  |  | (2,712 | ) |  |  | 80,937 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | $ | 134,877 |  |  | $ | 110 |  |  | $ | (3,385 | ) |  | $ | 131,602 |
|  | 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 June 30, 2024 (unaudited) |  | $ | 37,893 |  |  | $ | (237 | ) |  | $ | 73,923 |  |  | $ | (3,148 | )
As of December 31, 2023 |  | $ | 18,193 |  |  | $ | (49 | ) |  | $ | 86,643 |  |  | $ | (3,928 | )
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Six months ended June 30, |  |  | Three months ended June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
|  | (unaudited) |  |  | (unaudited) |  |  | (unaudited) |  |  | (unaudited) |
Gross realized gains from sale of available-for-sale marketable securities |  | $ | 15 |  |  | $ | 92 |  |  | $ | 6 |  |  | $ | — |
Gross realized losses from sale of available-for-sale marketable securities |  | $ | (5 | ) |  | $ | (16 | ) |  | $ | — |  |  | $ | (16 | )

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