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Note 4 - Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2026
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | March 31, 2026 (Unaudited) |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 111,257 |  |  | $ | 65 |  |  | $ | (297 | ) |  | $ | 111,025 |
Available-for-sale - matures after one year through four years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 78,595 |  |  |  | 82 |  |  |  | (512 | ) |  |  | 78,165 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | $ | 189,852 |  |  | $ | 147 |  |  | $ | (809 | ) |  | $ | 189,190 |
|  | December 31, 2025 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 106,154 |  |  | $ | 157 |  |  | $ | (407 | ) |  | $ | 105,904 |
Available-for-sale - matures after one year through three years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 73,103 |  |  |  | 366 |  |  |  | (71 | ) |  |  | 73,398 |
Total |  | $ | 179,257 |  |  | $ | 523 |  |  | $ | (478 | ) |  | $ | 179,302 |
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, 2026 (unaudited) |  | $ | 99,907 |  |  | $ | (582 | ) |  | $ | 25,012 |  |  | $ | (227 | )
As of December 31, 2025 |  | $ | 65,252 |  |  | $ | (115 | ) |  | $ | 32,678 |  |  | $ | (363 | )

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