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Note 6 - Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2019
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | September 30, 2019 (Unaudited) |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 17,245 |  |  | $ | 13 |  |  | $ | (30 | ) |  | $ | 17,228 |
|  |  | 17,245 |  |  |  | 13 |  |  |  | (30 | ) |  |  | 17,228 |
Available-for-sale - matures after one year through five years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government bonds |  |  | 501 |  |  |  | — |  |  |  | (1 | ) |  |  | 500 |
Corporate bonds |  |  | 52,770 |  |  |  | 162 |  |  |  | (198 | ) |  |  | 52,734 |
|  |  | 53,271 |  |  |  | 162 |  |  |  | (199 | ) |  |  | 53,234 |
Total |  | $ | 70,516 |  |  | $ | 175 |  |  | $ | (229 | ) |  | $ | 70,462 |
|  | December 31, 2018 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 6,094 |  |  | $ | — |  |  | $ | (32 | ) |  | $ | 6,062 |
|  |  | 6,094 |  |  |  | — |  |  |  | (32 | ) |  |  | 6,062 |
Available-for-sale - matures after one year through five years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposits |  |  | 747 |  |  |  | — |  |  |  | — |  |  |  | 747 |
Government bonds |  |  | 501 |  |  |  | — |  |  |  | (5 | ) |  |  | 496 |
Corporate bonds |  |  | 71,350 |  |  |  | 134 |  |  |  | (1,320 | ) |  |  | 70,164 |
|  |  | 72,598 |  |  |  | 134 |  |  |  | (1,325 | ) |  |  | 71,407 |
Total |  | $ | 78,692 |  |  | $ | 134 |  |  | $ | (1,357 | ) |  | $ | 77,469 |
Available-for-sale Securities, Continuous 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, 2019 (unaudited) |  | $ | 12,974 |  |  | $ | (110 | ) |  | $ | 30,835 |  |  | $ | (119 | )
As of December 31, 2018 |  | $ | 16,580 |  |  | $ | (192 | ) |  | $ | 52,590 |  |  | $ | (1,165 | )
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Nine months ended September 30, |  |  | Three months ended September 30, |
|  | 2019 (unaudited) |  |  | 2018 (unaudited) |  |  | 2019 (unaudited) |  |  | 2018 (unaudited) |
Gross realized gains from sale of available-for-sale marketable securities |  | $ | 1 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | — |
Gross realized losses from sale of available-for-sale marketable securities |  | $ | (39 | ) |  | $ | (34 | ) |  | $ | (4 | ) |  | $ | (32 | )

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