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Business Segment Information (Details 1) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Summary total assets for the business segments
Total assets	$ 131,463	$ 125,778
GRE [Member]
Summary total assets for the business segments
Total assets	122,992	112,521
Afek [Member]
Summary total assets for the business segments
Total assets	1,228	2,588
GOGAS [Member]
Summary total assets for the business segments
Total assets	4,516	7,887
Corporate [Member]
Summary total assets for the business segments
Total assets	$ 2,727	$ 2,782

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- References

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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