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Note 6 - Marketable Securities | 9 Months Ended
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Sep. 30, 2019
Notes to Financial Statements |
Cash, Cash Equivalents, and Marketable Securities [Text Block] | NOTE 6 : MARKETABLE SECURITIES The following is a summary of available-for-sale marketable securities:
|  | 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 |
The following table presents gross unrealized losses and fair values for those investments that were in an unrealized loss position as of September 30, 2019 and December 31, 2018, and the length of time that those investments have been in a continuous loss position:
|  | 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 | )
As of September 30, 2019 and December 31, 2018, management believes the impairments are not other than temporary and therefore the impairment losses were recorded in accumulated other comprehensive income (loss). The following table presents gross realized gains and losses from sale of available-for-sale marketable securities:
|  | 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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