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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Schedule of marketable securities |
|  | December 31, |
|  | 2 0 2 0 |  |  | 2 0 1 9 |
|  | U.S. dollars in thousands |
Short-term marketable securities (a): |  |  |  |  |  |
Municipal bond |  | $ | - |  |  | $ | 103 |
Corporate bond |  |  | 1,576 |  |  |  | 1,813 |
Total |  | $ | 1,576 |  |  | $ | 1,916 |
Long-term marketable security - bond (b): |  | $ | - |  |  | $ | 129 |
| (a) | The Company invests in highly-rated marketable securities, and its policy limits the amount of credit exposure to any one issuer. The Company’s investment policy requires investments to be investment grade, rated BBB- or better, with the objective of minimizing the potential risk of principal loss. Fair values were determined for each individual security in the investment portfolio, based on quoted prices in active markets.
| (b) | As of December 31, 2019, the Company held a long-term bond which was classified as available-for-sale security and presented at fair value. The fair value of the available-for-sale security was based on quoted prices in active markets for identical instruments (Level 1 as defined under ASC 820, “Fair Value Measurement”).

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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