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Variable Interest Entity (Details 1) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Summarized consolidated balance sheet amounts related to CCE
Total assets	$ 1,423	$ 2,035
Total liabilities and noncontrolling interests	1,423	2,035
Cash and cash equivalents [Member]
Summarized consolidated balance sheet amounts related to CCE
Total assets	51	52
Restricted cash [Member]
Summarized consolidated balance sheet amounts related to CCE
Total assets	7	31
Trade accounts receivable [Member]
Summarized consolidated balance sheet amounts related to CCE
Total assets	576	1,031
Prepaid expenses [Member]
Summarized consolidated balance sheet amounts related to CCE
Total assets	402	451
Other current assets [Member]
Summarized consolidated balance sheet amounts related to CCE
Total assets	29	31
Other assets [Member]
Summarized consolidated balance sheet amounts related to CCE
Total assets	358	439
Current liabilities [Member]
Summarized consolidated balance sheet amounts related to CCE
Total liabilities and noncontrolling interests	576	698
Due to IDT Energy [Member]
Summarized consolidated balance sheet amounts related to CCE
Total liabilities and noncontrolling interests	1,562	1,140
Noncontrolling interests [Member]
Summarized consolidated balance sheet amounts related to CCE
Total liabilities and noncontrolling interests	$ (715)	$ 197

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- References

No definition available.

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- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5710-111685

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- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
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