Income taxes (Details)	12 Months Ended
Oct. 31, 2021
Income Tax Disclosure [Abstract]
Ordinary taxable income distributed as dividends (percentage)	100.00%

The total percentage of ordinary taxable income declared as dividends in the period.

No definition available.

Name:	frevsob_DistributedEarningsPercentage
Namespace Prefix:	frevsob_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration