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Note 6 - Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | September 30, 2021 (Unaudited) |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 5,410 |  |  | $ | 25 |  |  | $ | — |  |  | $ | 5,435 |
Available-for-sale - matures after one year through five years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 68,661 |  |  |  | 466 |  |  |  | (413 | ) |  |  | 68,714 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | $ | 74,071 |  |  | $ | 491 |  |  | $ | (413 | ) |  | $ | 74,149 |
|  | December 31, 2020 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 12,667 |  |  | $ | 49 |  |  | $ | (7 | ) |  | $ | 12,709 |
Available-for-sale - matures after one year through five years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 75,483 |  |  |  | 667 |  |  |  | (105 | ) |  |  | 76,045 |
Total |  | $ | 88,150 |  |  | $ | 716 |  |  | $ | (112 | ) |  | $ | 88,754 |
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 September 30, 2021 (unaudited) |  | $ | 26,507 |  |  | $ | (339 | ) |  | $ | 4,102 |  |  | $ | (74 | )
As of December 31, 2020 |  | $ | 31,393 |  |  | $ | (91 | ) |  | $ | 7,381 |  |  | $ | (21 | )
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Nine months ended September 30, |  |  | Three months ended September 30, |
|  | 2021 (unaudited) |  |  | 2020 (unaudited) |  |  | 2021 (unaudited) |  |  | 2020 (unaudited) |
Gross realized gains from sale of available-for-sale marketable securities |  | $ | 43 |  |  | $ | 4 |  |  | $ | — |  |  | $ | — |
Gross realized losses from sale of available-for-sale marketable securities |  | $ | (30 | ) |  | $ | (19 | ) |  | $ | (2 | ) |  | $ | — |

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