XML 34 R24.htm IDEA: XBRL DOCUMENT
v3.20.2

Note 5 - Marketable Securities (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2020
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | June 3 0, 20 20 (Unaudited) |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 16,772 |  |  | $ | 62 |  |  | $ | (27 | ) |  | $ | 16,807 |
|  |  | 16,772 |  |  |  | 62 |  |  |  | (27 | ) |  |  | 16,807 |
Available-for-sale - matures after one year through five years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 50,272 |  |  |  | 547 |  |  |  | (333 | ) |  |  | 50,486 |
|  |  | 50,272 |  |  |  | 547 |  |  |  | (333 | ) |  |  | 50,486 |
Total |  | $ | 67,044 |  |  | $ | 609 |  |  | $ | (360 | ) |  | $ | 67,293 |
|  | December 31, 201 9 |
|  | 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 |
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 June 30, 2020 (unaudited) |  | $ | 28,365 |  |  | $ | (340 | ) |  | $ | 2,974 |  |  | $ | (20 | )
As of December 31, 2019 |  | $ | 22,852 |  |  | $ | (102 | ) |  | $ | 14,231 |  |  | $ | (32 | )
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Six months ended June 30, |  |  | Three months ended June 3 0, |
|  | 20 20 |  |  | 201 9 |  |  | 20 20 |  |  | 201 9 |
|  | (unaudited) |  |  | (unaudited) |  |  | (unaudited) |  |  | (unaudited) |
Gross realized gains from sale of available-for-sale marketable securities |  | $ | 4 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Gross realized losses from sale of available-for-sale marketable securities |  | $ | (19 | ) |  | $ | (35 | ) |  | $ | (13 | ) |  | $ | (11 | )

X
- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
Name: | us-gaap_ScheduleOfRealizedGainLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration