Investment in tenancy-in-common (Schedule of balance sheet of Pierre Property) (Details) - USD ($) $ in Thousands	Jan. 31, 2021	Oct. 31, 2020	Jan. 31, 2020	Oct. 31, 2019
Schedule of Equity Method Investments [Line Items]
Real estate, net	$ 276,096	$ 278,150
Cash and cash equivalents	39,788	36,860	$ 31,904
Tenants' security accounts	1,451	1,408
Receivables and other assets	1,714	1,811
Total Assets	355,855	355,215
Mortgages payable, net of unamortized debt issuance costs	304,680	305,430
Accounts payable and accrued expenses	2,901	2,277
Tenants' security deposits	2,060	2,124
Deferred revenue	928	1,043
Equity	31,920	30,863	$ 13,277	$ 16,048
Total Liabilities and Equity	355,855	355,215
FREIT's investment in TIC (65% interest)	20,074	20,101
Pierre Property [Member]
Schedule of Equity Method Investments [Line Items]
Real estate, net	79,536	80,041
Cash and cash equivalents	1,155	754
Tenants' security accounts	529	523
Receivables and other assets	430	468
Total Assets	81,650	81,786
Mortgages payable, net of unamortized debt issuance costs	49,890	49,956
Accounts payable and accrued expenses	297	314
Tenants' security deposits	521	535
Deferred revenue	59	56
Equity	30,883	30,925
Total Liabilities and Equity	81,650	81,786
FREIT's investment in TIC (65% interest)	$ 20,074	$ 20,101