Subsequent Events—Acquisitions (Details Narrative) - Subsequent Event [Member] - USD ($)	Mar. 03, 2022	Mar. 01, 2022
Net2phone 2.0, Inc [Member]
Subsequent Event [Line Items]
Contingent consideration, description	contingent consideration of up to $3.5 million based on annual cumulative incremental recurring seat revenue over a four-year period payable in cash and/or shares at net2phone 2.0, Inc.’s discretion.
Contingent consideration	$ 3,500,000
IDT International Telecom, Inc [Member]
Subsequent Event [Line Items]
Contingent consideration, description		contingent consideration of up to $5.5 million based on annual gross profit over a five-year period.
Contingent consideration		$ 5,500,000
Net2phone 2.0, Inc [Member]
Subsequent Event [Line Items]
Acquisitions, value	15,000,000.0
Purchase price in cash	7,200,000
Working capital adjustment	$ 3,300,000
Net2phone 2.0, Inc [Member] | Common Class B, Shares of IDT [Member]
Subsequent Event [Line Items]
Number of shares issued	27,765
Net2phone 2.0, Inc [Member] | Common Class B [Member]
Subsequent Event [Line Items]
Number of shares issued, value	$ 1,000,000.0
IDT International Telecom, Inc [Member]
Subsequent Event [Line Items]
Acquisitions, value		6,050,000.00
Purchase price in cash		500,000
Working capital adjustment		$ 50,000