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Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Note 19 — Subsequent Event In the first quarter of 2020, Lumo paid off its term loan to GREI in exchange for additional shares which resulted in GREI's interest in Lumo increasing to 92.5%. On February 18, 2020, named Plaintiff Danelle Davis filed a putative class action complaint against Residents Energy and GRE in United States District Court for the District of New Jersey alleging violation of the Telephone Consumer Protection Act, 47 U.S.C. § 227 et seq. IDT Energy denies the allegations in the complaint which it to be meritless and plans to vigorously defend this action. Based upon the Company’s preliminary assessment of this matter, a loss is not considered probable, nor is the amount of loss, if any, estimable.