Investment in tenancy-in-common ('TIC') (Schedule of balance sheet of Pierre Property) (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Schedule of Equity Method Investments [Line Items]
Real estate, net	$ 278,150	$ 330,108
Cash and cash equivalents	36,860	38,075	$ 21,747
Tenants' security accounts	1,408	2,278
Receivables and other assets	1,811	1,741
Total Assets	355,215	390,618
Mortgages payable, net of unamortized debt issuance costs	305,430	349,904
Accounts payable and accrued expenses	2,277	3,097
Tenants' security deposits	2,124	3,381
Deferred revenue	1,043	1,390
Equity	30,863	16,048	$ 24,344	$ 28,590
Total Liabilities and Equity	355,215	390,618
FREIT's investment in TIC (65% interest)	20,101
Pierre Property [Member]
Schedule of Equity Method Investments [Line Items]
Real estate, net	80,041
Cash and cash equivalents	754
Tenants' security accounts	523
Receivables and other assets	468
Total Assets	81,786
Mortgages payable, net of unamortized debt issuance costs	49,956
Accounts payable and accrued expenses	314
Tenants' security deposits	535
Deferred revenue	56
Equity	30,925
Total Liabilities and Equity	81,786
FREIT's investment in TIC (65% interest)	$ 20,101