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Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended |  |  |  |
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Aug. 15, 2013 | May 15, 2013 | Feb. 15, 2013 | Sep. 30, 2013 | Sep. 30, 2013 | Mar. 11, 2013 | Oct. 17, 2012 | Sep. 30, 2013 August 2, 2012 [Member] | Sep. 30, 2013 November 26, 2012 [Member] | Aug. 31, 2013 IDT Energy [Member] | May 31, 2013 IEI [Member] | Nov. 30, 2008 IEI [Member] | Dec. 31, 2011 DAD Sales LLC [Member] | Nov. 04, 2013 Genie Mongolia [Member] Michael Jonas [Member] | Nov. 26, 2012 Common Stock Class B [Member] | Aug. 02, 2012 Common Stock Class B [Member] | Sep. 30, 2013 Common Stock Class B [Member] Stock Repurchase Program [Member] | Mar. 11, 2013 Common Stock Class B [Member] Stock Repurchase Program [Member]
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock authorized to be repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000
Remaining number of shares available for repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 |
Common stock exchange into of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,150,000 | 8,750,000 |  |
Issuance of series A preferred stock in exchange for class B common stock |  |  |  |  |  | 313,376 | 1,604,591 |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  |  |  |  |  |  | 10.00% | 100.00% |  |  |  |  |
Percentage of equity in subsidiary, fully diluted, granted to other officers and employees |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Fair value of the grants of equity interests |  |  |  |  |  |  |  |  |  |  | $ 0.2 |  |  |  |  |  |  |
Company's Class B common stock issued in exchange for deferred stock units |  |  |  |  |  |  |  |  |  | 133,758 |  |  |  |  |  |  |  |
Vested deferred stock units exchanged with class B common stock |  |  |  |  |  |  |  |  |  | 23.6 |  |  |  |  |  |  |  |
Terms of offer to exchange class B common stock shares for preferred stock shares |  |  |  |  |  |  |  | The Company initiated an offer to exchange up to 8.75 million outstanding shares of its Class B common stock for the same number of shares of its Preferred Stock. The offer expired on October 10, 2012. | The Company initiated an offer to exchange up to 7.15 million outstanding shares of its Class B common stock for the same number of shares of its Preferred Stock. The offer expired on March 5, 2013. |  |  |  |  |  |  |  |  |
Maximum Subsidiary Capitalization For Anti Dilution Protection |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |
Percentage of equity in subsidiary, granted to related party. |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |
Company paid a pro-rated Base Dividend on Series 2012-A Preferred Stock | $ 0.1594 | $ 0.1594 | $ 0.1317 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's Board of Directors declared a quarterly Base Dividend |  |  |  | $ 0.1594 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Date to be Paid |  |  |  |  | Nov. 15, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared and paid on preferred stock |  |  |  |  | $ 0.8 |  |  |  |  |  |  |  |  |  |  |  |  |
Employment agreement description |  |  |  |  | In October of 2013, the Company completed the sale to the employee of 9.5% of the equity in Afek per the terms of his employment agreement |  |  |  |  |  |  |  |  |  |  |  |  |

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