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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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Amount of investment in marketable security, classified as current.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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