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Equity (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Summarized combined balance sheets of CCE, DAD and Tari    
Total assets $ 2,541 $ 4,596
Total liabilities and noncontrolling interests 2,541 4,596
Cash and cash equivalents [Member]
    
Summarized combined balance sheets of CCE, DAD and Tari    
Total assets 14 434
Restricted cash [Member]
    
Summarized combined balance sheets of CCE, DAD and Tari    
Total assets 118 537
Trade accounts receivable [Member]
    
Summarized combined balance sheets of CCE, DAD and Tari    
Total assets 1,592 2,459
Prepaid expenses [Member]
    
Summarized combined balance sheets of CCE, DAD and Tari    
Total assets 91 364
Other current assets [Member]
    
Summarized combined balance sheets of CCE, DAD and Tari    
Total assets 277 353
Other assets [Member]
    
Summarized combined balance sheets of CCE, DAD and Tari    
Total assets 449 449
Current Liability [Member]
    
Summarized combined balance sheets of CCE, DAD and Tari    
Total liabilities and noncontrolling interests 1,412 2,937
Due to IDT Energy [Member]
    
Summarized combined balance sheets of CCE, DAD and Tari    
Total liabilities and noncontrolling interests 348 964
Noncontrolling Interests [Member]
    
Summarized combined balance sheets of CCE, DAD and Tari    
Total liabilities and noncontrolling interests $ 781 $ 695