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Note 13 - Selected Statements of Income Data | 12 Months Ended
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Dec. 31, 2019
Notes to Financial Statements |
Interest and Other Income [Text Block] | NOTE 13: SELECTED STATEMENTS OF INCOME DATA a. Financial income, net:
|  | 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 |
b . Revaluation of investment in other company : The Company recorded a loss of $870 in 2018 related to revaluation of its investment in other company. During the year ended December 31, 2019, no impairment loss was identified. The following table summarizes the total carrying value of the Company’s investment in other company held as of December 31, 2019 including cumulative unrealized downward adjustments made to the initial cost basis of the investment:
Initial cost basis |  | $ | 1,806 |
Downward adjustments |  |  | (870 | )
Total carrying value at the end of the period |  | $ | 936 |

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- Definition The entire disclosure for interest and other income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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