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Variable Interest Entities (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]    
TOTAL ASSETS $ 1,915 $ 3,043
TOTAL LIABILITIES AND NONCONTROLLING INTERESTS 1,915 3,043
Cash and cash equivalents [Member]    
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]    
TOTAL ASSETS 48 33
Restricted cash [Member]    
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]    
TOTAL ASSETS 25 20
Trade accounts receivable [Member]    
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]    
TOTAL ASSETS 844 1,873
Prepaid expenses [Member]    
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]    
TOTAL ASSETS 479 480
Other current assets [Member]    
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]    
TOTAL ASSETS 51 178
Other assets [Member]    
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]    
TOTAL ASSETS 468 459
Current liabilities [Member]    
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]    
TOTAL LIABILITIES AND NONCONTROLLING INTERESTS 267 479
Due to IDT Energy [Member]    
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]    
TOTAL LIABILITIES AND NONCONTROLLING INTERESTS 427 1,377
Noncontrolling interests [Member]    
Variable Interest Entity, Classification of Carrying Amount, Assets and Liabilities, Net [Abstract]    
TOTAL LIABILITIES AND NONCONTROLLING INTERESTS $ 1,221 $ 1,187