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Variable Interest Entity (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Variable Interest Entity Classifications Of Carrying Amount Assets And Liabilities Net [Abstract]    
Total assets $ 142,421 $ 156,244
CCE [Member]    
Variable Interest Entity Classifications Of Carrying Amount Assets And Liabilities Net [Abstract]    
Total assets 1,336 1,576
Total liabilities and noncontrolling interests 1,336 1,576
CCE [Member] | Cash and cash equivalents [Member]    
Variable Interest Entity Classifications Of Carrying Amount Assets And Liabilities Net [Abstract]    
Total assets 260 250
CCE [Member] | Trade accounts receivable [Member]    
Variable Interest Entity Classifications Of Carrying Amount Assets And Liabilities Net [Abstract]    
Total assets 339 586
CCE [Member] | Prepaid expenses and other current assets [Member]    
Variable Interest Entity Classifications Of Carrying Amount Assets And Liabilities Net [Abstract]    
Total assets 378 381
CCE [Member] | Other assets [Member]    
Variable Interest Entity Classifications Of Carrying Amount Assets And Liabilities Net [Abstract]    
Total assets 359 359
CCE [Member] | Current liabilities [Member]    
Variable Interest Entity Classifications Of Carrying Amount Assets And Liabilities Net [Abstract]    
Total liabilities and noncontrolling interests 453 467
CCE [Member] | Due to IDT Energy [Member]    
Variable Interest Entity Classifications Of Carrying Amount Assets And Liabilities Net [Abstract]    
Total liabilities and noncontrolling interests 3,120 2,598
CCE [Member] | Noncontrolling interests [Member]    
Variable Interest Entity Classifications Of Carrying Amount Assets And Liabilities Net [Abstract]    
Total liabilities and noncontrolling interests $ (2,237) $ (1,489)