Fair Value Measurements (Details Textual) $ in Thousands	Jan. 31, 2020 USD ($)
Fair Value Disclosures [Abstract]
Spin-Off, IDT contribution investment amount	$ 2,000

Fair value estimate not practicable cost method investment.

No definition available.

Name:	rfl_FairValueEstimateNotPracticableCostMethodInvestment
Namespace Prefix:	rfl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant