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Note 7 - Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | September 30, 2023 (Unaudited) |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 26,009 |  |  | $ | — |  |  | $ | (1,116 | ) |  | $ | 24,893 |
Available-for-sale - matures after one year through three years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 83,990 |  |  |  | 1 |  |  |  | (4,703 | ) |  |  | 79,288 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | $ | 109,999 |  |  | $ | 1 |  |  | $ | (5,819 | ) |  | $ | 104,181 |
|  | December 31, 2022 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 17,552 |  |  | $ | — |  |  | $ | (1,330 | ) |  | $ | 16,222 |
Available-for-sale - matures after one year through five years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 101,355 |  |  |  | 38 |  |  |  | (5,535 | ) |  |  | 95,858 |
Total |  | $ | 118,907 |  |  | $ | 38 |  |  | $ | (6,865 | ) |  | $ | 112,080 |
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 l oss |  |  | Fair value |  |  | Gross unrealized loss |
As of September 30, 2023 (unaudited) |  | $ | 26,887 |  |  | $ | (427 | ) |  | $ | 75,779 |  |  | $ | (5,392 | )
As of December 31, 2022 |  | $ | 58,706 |  |  | $ | (1,885 | ) |  | $ | 48,539 |  |  | $ | (4,980 | )
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Nine months ended September 30, |  |  | Three months ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
|  | (unaudited) |  |  | (unaudited) |  |  | (unaudited) |  |  | (unaudited) |
Gross realized gains from sale of available-for-sale marketable securities |  | $ | 92 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Gross realized losses from sale of available-for-sale marketable securities |  | $ | (24 | ) |  | $ | (25 | ) |  | $ | (8 | ) |  | $ | (4 | )

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