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Note 3 - Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | As at 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 |
|  | As at 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 December 31, 2024 |  | $ | 28,762 |  |  | $ | (160 | ) |  | $ | 61,996 |  |  | $ | (1,589 | )
As of December 31, 2023 |  | $ | 18,193 |  |  | $ | (49 | ) |  | $ | 86,643 |  |  | $ | (3,928 | )
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Year ended December 31, |
|  | 2022 |  |  | 2023 |  |  | 2024 |
Gross realized gains from sale of available-for-sale marketable securities |  | $ | — |  |  | $ | 114 |  |  | $ | 19 |
Gross realized losses from sale of available-for-sale marketable securities |  | $ | (55 | ) |  | $ | (24 | ) |  | $ | (5 | )

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