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Note 3 - Marketable Securities | 12 Months Ended
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Dec. 31, 2019
Notes to Financial Statements |
Cash, Cash Equivalents, and Marketable Securities [Text Block] | NOTE 3: MARKETABLE SECURITIES The following is a summary of available-for-sale marketable securities at December 31, 2018 and 2019:
|  | As at December 31, 2019 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 18,224 |  |  | $ | 16 |  |  | $ | (11 | ) |  | $ | 18,229 |
|  |  | 18,224 |  |  |  | 16 |  |  |  | (11 | ) |  |  | 18,229 |
Available-for-sale - matures after one year through five years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 46,593 |  |  |  | 168 |  |  |  | (123 | ) |  |  | 46,638 |
|  |  | 46,593 |  |  |  | 168 |  |  |  | (123 | ) |  |  | 46,638 |
Total |  | $ | 64,817 |  |  | $ | 184 |  |  | $ | (134 | ) |  | $ | 64,867 |
|  | As at 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 December 31, 2018 and 2019, 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 December 31, 2019 |  | $ | 22,852 |  |  | $ | (102 | ) |  | $ | 14,231 |  |  | $ | (32 | )
As of December 31, 2018 |  | $ | 16,580 |  |  | $ | (192 | ) |  | $ | 52,590 |  |  | $ | (1,165 | )
As of December 31, 2018 and 2019, management believes the impairments are not other than temporary and therefore the unrealized 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:
|  | Year ended December 31, |
|  | 2017 |  |  | 201 8 |  |  | 201 9 |
Gross realized gains from sale of available-for-sale marketable securities |  | $ | 47 |  |  | $ | 4 |  |  | $ | 13 |
Gross realized losses from sale of available-for-sale marketable securities |  | $ | (47 | ) |  | $ | (71 | ) |  | $ | (41 | )

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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