Investment in tenancy-in-common (Schedule of balance sheet of Pierre Property) (Details) - USD ($) $ in Thousands	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Schedule of Equity Method Investments [Line Items]
Real estate, net	$ 270,634	$ 278,150
Cash and cash equivalents	35,891	36,860	$ 38,075
Tenants' security accounts	1,340	1,408
Receivables and other assets	1,622	1,811
Total Assets	346,105	355,215
Mortgages payable, net of unamortized debt issuance costs	299,876	305,430
Accounts payable and accrued expenses	2,375	2,277
Tenants' security deposits	2,039	2,124
Deferred revenue	1,143	1,043
Equity	31,951	30,863	$ 16,048	$ 24,344
Total Liabilities and Equity	346,105	355,215
FREIT's investment in TIC (65% interest)	19,383	20,101
Pierre Property [Member]
Schedule of Equity Method Investments [Line Items]
Real estate, net	78,023	80,041
Cash and cash equivalents	1,338	754
Tenants' security accounts	484	523
Receivables and other assets	510	468
Total Assets	80,355	81,786
Mortgages payable, net of unamortized debt issuance costs	49,691	49,956
Accounts payable and accrued expenses	261	314
Tenants' security deposits	484	535
Deferred revenue	99	56
Equity	29,820	30,925
Total Liabilities and Equity	80,355	81,786
FREIT's investment in TIC (65% interest)	$ 19,383	$ 20,101