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INFORMATION ON GEOGRAPHIC AREAS AND MAJOR CUSTOMERS (Schedule of Revenues by Geographic Area) (Details) - Geographic Concentration [Member] - Revenue [Member]		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Percentage		100.00%	100.00%	100.00%
USA [Member]
Segment Reporting Information [Line Items]
Percentage		52.00%	49.00%	44.00%
Japan [Member]
Segment Reporting Information [Line Items]
Percentage		32.00%	36.00%	41.00%
Asia [Member]
Segment Reporting Information [Line Items]
Percentage	[1]	12.00%	12.00%	11.00%
Europe [Member]
Segment Reporting Information [Line Items]
Percentage	[1]	4.00%	3.00%	4.00%
[1] Represents revenues from individual countries of less than 10% each.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 275
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-Section 50
-Paragraph 21
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-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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