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Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Operating results for the business segments |  |  |  |
Revenues | $ 71,638 | $ 63,725 | $ 212,103 | $ 164,056
Income (loss) from operations | 3,948 | 3,469 | 1,011 | 1,155
Research and development | 2,653 | 2,264 | 7,734 | 7,141
Equity in the net loss of AMSO, LLC | 672 | 508 | 2,607 | 2,252
IDT Energy [Member] |  |  |  |
Operating results for the business segments |  |  |  |
Revenues | 71,638 | 63,725 | 212,103 | 164,056
Income (loss) from operations | 9,596 | 8,679 | 18,972 | 17,108
Research and development |  |  |  |
Equity in the net loss of AMSO, LLC |  |  |  |
Genie Oil and Gas [Member] |  |  |  |
Operating results for the business segments |  |  |  |
Revenues |  |  |  |
Income (loss) from operations | (3,699) | (3,171) | (11,507) | (10,169)
Research and development | 2,653 | 2,264 | 7,734 | 7,141
Equity in the net loss of AMSO, LLC | 672 | (508) | (2,607) | (2,252)
Corporate [Member] |  |  |  |
Operating results for the business segments |  |  |  |
Revenues |  |  |  |
Income (loss) from operations | (1,949) | (2,039) | (6,454) | (5,784)
Research and development |  |  |  |
Equity in the net loss of AMSO, LLC |  |  |  |

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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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