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Note 13 - Selected Statements of Income Data (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Interest and Other Income [Table Text Block] |
|  | Year ended December 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
Interest income |  | $ | 4,233 |  |  | $ | 4,499 |  |  | $ | 4,220 |
Loss on available-for-sale marketable securities, net |  |  | — |  |  |  | (67 | ) |  |  | (28 | )
Amortization of premium on available-for-sale marketable securities, net |  |  | (1,179 | ) |  |  | (773 | ) |  |  | (554 | )
Foreign exchange loss, net |  |  | (28 | ) |  |  | (241 | ) |  |  | (347 | )
Total |  | $ | 3,026 |  |  | $ | 3,418 |  |  | $ | 3,291 |
Equity Securities without Readily Determinable Fair Value [Table Text Block] |
Initial cost basis |  | $ | 1,806 |
Downward adjustments |  |  | (870 | )
Total carrying value at the end of the period |  | $ | 936 |

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- Definition Tabular disclosure of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117539-209714 + Details
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- Definition Tabular disclosure of interest income and income classified as other. + References No definition available. + Details
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