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Note 7 - Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2025 (Unaudited) |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 50,425 |  |  | $ | 118 |  |  | $ | (424 | ) |  | $ | 50,119 |
Available-for-sale - matures after one year through three years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 75,632 |  |  |  | 322 |  |  |  | (505 | ) |  |  | 75,449 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | $ | 126,057 |  |  | $ | 440 |  |  | $ | (929 | ) |  | $ | 125,568 |
|  | December 31, 2024 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 61,113 |  |  | $ | 41 |  |  | $ | (146 | ) |  | $ | 61,008 |
Available-for-sale - matures after one year through three years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 83,491 |  |  |  | 221 |  |  |  | (1,603 | ) |  |  | 82,109 |
Total |  | $ | 144,604 |  |  | $ | 262 |  |  | $ | (1,749 | ) |  | $ | 143,117 |
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, 2025 (unaudited) |  | $ | 16,023 |  |  | $ | (35 | ) |  | $ | 31,739 |  |  | $ | (894 | )
As of December 31, 2024 |  | $ | 28,762 |  |  | $ | (160 | ) |  | $ | 61,996 |  |  | $ | (1,589 | )
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Six months ended June 30, |  |  | Three months ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | (unaudited) |  |  | (unaudited) |  |  | (unaudited) |  |  | (unaudited) |
Gross realized gains from sale of available-for-sale marketable securities |  | $ | 16 |  |  | $ | 15 |  |  | $ | 16 |  |  | $ | 6 |
Gross realized losses from sale of available-for-sale marketable securities |  | $ | — |  |  | $ | (5 | ) |  | $ | — |  |  | $ | — |

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