Income taxes (Details)	12 Months Ended
Oct. 31, 2020
Income Tax Disclosure [Abstract]
Ordinary taxable income distributed as dividends (percentage)	100.00%
Capital gain from sale of property as dividends (percentage)	100.00%

Percentage Of Capital Gain From Sale Of Property Distributed As Dividends.

No definition available.

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Namespace Prefix:	frevsob_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration