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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
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