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MARKETABLE SECURITIES (Schedule of Company's Marketable Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Level 2 securities: |  |  |  |
Marketable securities |  | $ 21,652 | $ 40,966 | $ 56,662
U.S government and agency bonds [Member] |  |  |  |
Level 2 securities: |  |  |  |
Marketable securities |  | 4,192 | 2,499 |
Canada government bonds [Member] |  |  |  |
Level 2 securities: |  |  |  |
Marketable securities |  |  | 999 |
Other foreign government bonds [Member] |  |  |  |
Level 2 securities: |  |  |  |
Marketable securities |  | 2,006 | 3,521 |
Corporate bonds [Member] |  |  |  |
Level 2 securities: |  |  |  |
Marketable securities | [1] | $ 15,454 | $ 33,947 |
[1] | Investments in Corporate bonds rated A or higher.

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