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Commitments and Contingencies (Details) (USD $)
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
BP [Member]
Jun. 30, 2014
IDT Energy [Member]
Commitments and Contingencies (Textual)        
Restricted cash pledged as collateral     $ 300,000  
Trade accounts receivable pledged as collateral     27,100,000  
Trade accounts payable 14,298,000 25,302,000 11,300,000  
Aggregate performance bonds outstanding       3,800,000
Line of credit facility, amount outstanding 7,600,000 5,700,000    
Purchase and other commitments 7,200,000      
Amount accrued for income tax audit 200,000      
Purchase of renewable energy credit       $ 15,900,000