Investment in tenancy-in-common (Schedule of balance sheet of Pierre Property) (Details) - USD ($) $ in Thousands	Apr. 30, 2022	Jan. 31, 2022	Oct. 31, 2021	Apr. 30, 2021	Jan. 31, 2021	Oct. 31, 2020
Schedule of Equity Method Investments [Line Items]
Real estate, net	$ 96,513		$ 270,634
Cash and cash equivalents	95,748		35,891	$ 38,627
Tenants' security accounts	1,030		1,340
Receivables and other assets	736		1,622
Total Assets	225,166		346,105
Mortgages payable, net of unamortized debt issuance costs	136,058		299,876
Accounts payable and accrued expenses	1,613		2,375
Tenants' security deposits	1,303		2,039
Deferred revenue	462		1,143
Equity	82,727	$ 82,029	31,951	$ 32,299	$ 31,920	$ 30,863
Total Liabilities and Equity	225,166		346,105
FREIT's investment in TIC (65% interest)	18,870		19,383
Pierre Property [Member]
Schedule of Equity Method Investments [Line Items]
Real estate, net	77,020		78,023
Cash and cash equivalents	1,430		1,338
Tenants' security accounts	457		484
Receivables and other assets	527		510
Total Assets	79,434		80,355
Mortgages payable, net of unamortized debt issuance costs	49,558		49,691
Accounts payable and accrued expenses	247		261
Tenants' security deposits	466		484
Deferred revenue	132		99
Equity	29,031		29,820
Total Liabilities and Equity	79,434		80,355
FREIT's investment in TIC (65% interest)	$ 18,870		$ 19,383