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Mortgages payable and credit line (Narrative) (Details) - USD ($)						1 Months Ended					2 Months Ended	3 Months Ended	12 Months Ended
	Aug. 26, 2019	Apr. 03, 2019	Feb. 07, 2018	Dec. 07, 2017	Jan. 14, 2013	Sep. 30, 2020	Feb. 28, 2018	Apr. 28, 2017	Sep. 29, 2016	Feb. 01, 2010	Nov. 01, 2020	Jun. 30, 2020	Oct. 31, 2020	Oct. 31, 2019	Jan. 21, 2019	Jan. 08, 2018
Debt Instrument [Line Items]
Amount drawn on loan													$ 307,240,000	$ 352,790,000
Legal fees													$ 957,000
Line of Credit [Member]
Debt Instrument [Line Items]
Maturity date of loan													Oct. 31, 2023
Line of Credit, available													$ 13,000,000
Grande Rotunda LLC [Member]
Debt Instrument [Line Items]
Fee amount							$ 900,000
Station Place on Monmouth, LLC [Member]
Debt Instrument [Line Items]
Basis points, interest rate				1.80%
Fixed interest rate current loan				4.35%
Loan amount				$ 12,350,000
Maturity date of loan				Dec. 15, 2027
Term of the loan				2 years
Percentage of acquisition				100.00%
Portion of outstanding principal balance guaranteed by FREIT															$ 2,350,000
WestFREIT Corp [Member]
Debt Instrument [Line Items]
Refinanced loan amount								$ 22,000,000
Basis points, interest rate								2.75%
Loan amount								$ 23,500,000
Maturity date of loan								Apr. 28, 2019
Net proceeds from refinancing of debt								$ 1,100,000
Percentage of acquisition								100.00%
Description of loan amendment terms								This refinancing resulted in: (i) a reduction in the annual interest rate from a fixed rate of 5.55% to a variable rate
Wells Fargo Bank [Member]
Debt Instrument [Line Items]
Basis points, interest rate										2.25%
Debt Instrument, collateral amount										$ 19,500,000
Loan amount										$ 22,500,000
Accrued interest on development fee paid			$ 45,000
Amount repaid			$ 115,300,000
Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment												$ 390,000
Fixed rate mortgage loans													141,945,000	212,070,000
Variable rate mortgage loan													$ 165,295,000	140,720,000
Deferred Interest												$ 222,000
Mortgages [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment											$ 319,000
Deferred Interest											$ 138,000
Mortgages [Member] \| Rockaway, NJ Mortgage [Member]
Debt Instrument [Line Items]
Fixed interest rate current loan													5.37%
Debt Instrument, Periodic Payment													$ 115,850
Debt Instrument, collateral amount													14,895,000
Fixed rate mortgage loans													$ 15,050,000	15,615,000
Mortgages [Member] \| Westwood, NJ#1 [Member]
Debt Instrument [Line Items]
Refinanced loan amount					$ 8,000,000.0
Mortgages [Member] \| Westwood, NJ #2 [Member]
Debt Instrument [Line Items]
Fixed interest rate current loan													4.75%
Debt Instrument, Periodic Payment													$ 129,702
Debt Instrument, collateral amount													7,078,000
Loan amount													22,750,000
Fixed rate mortgage loans													18,695,000	18,973,000
Mortgages [Member] \| Wayne, NJ Mortgage [Member] \| Berdan Court, LLC [Member]
Debt Instrument [Line Items]
Refinanced loan amount	$ 17,000,000
Fixed interest rate on old loan	6.09%
Fixed interest rate current loan	3.54%
Debt Instrument, Periodic Payment	$ 85,004
Debt Instrument, collateral amount													1,530,000
Loan amount	$ 28,815,000
Maturity date of loan	Sep. 01, 2029
Term of the loan	5 years
Net proceeds from refinancing of debt	$ 11,600,000
Future periodic payment including principal	$ 130,036
Percentage of acquisition	100.00%
Fixed rate mortgage loans													$ 28,815,000	28,815,000
Mortgages [Member] \| Hackensack, NJ [Member] \| Pierre Towers, LLC [Member]
Debt Instrument [Line Items]
Fixed interest rate on old loan													5.38%
Debt Instrument, Periodic Payment													$ 155,200
Loan amount													$ 48,000,000
Maturity date of loan													Jan. 01, 2028
Term of the loan													5 years
Net proceeds from refinancing of debt													$ 17,200,000
Future periodic payment including principal													225,851
Mortgage prepayment penalty													1,200,000
Fixed rate mortgage loans														48,000,000		$ 29,100,000
Mortgages [Member] \| River Edge, NJ Refinanced Mortgage [Member]
Debt Instrument [Line Items]
Fixed interest rate current loan													4.54%
Debt Instrument, Periodic Payment													$ 57,456
Debt Instrument, collateral amount													706,000
Loan amount													11,200,000
Mortgages [Member] \| Red Bank, NJ Refinanced Mortgage [Member]
Debt Instrument [Line Items]
Debt Instrument, collateral amount													18,766,000
Mortgages [Member] \| Wayne, PSC LLC [Member]
Debt Instrument [Line Items]
Refinanced loan amount									$ 24,200,000				$ 25,800,000
Basis points, interest rate													2.20%
Fixed interest rate on old loan													6.04%
Fixed interest rate current loan													3.625%
Membership interest percentage													40.00%
Debt Instrument, collateral amount													$ 24,076,000
Debt Instrument, collateral amount classified as construction in progress													400,000
Loan amount													$ 25,800,000
Description of variable interest rate													a reduction in interest rate from 6.04% to 3.625%
Maturity date of loan													Oct. 01, 2026
Net proceeds from refinancing of debt													$ 1,000,000
Fixed rate mortgage loans													$ 23,336,000	23,737,000
Mortgages [Member] \| S And A Commercial Associates Limited Partnership [Member]
Debt Instrument [Line Items]
Membership interest percentage													65.00%
Net proceeds from refinancing of debt													$ 11,200,000
Mortgages [Member] \| Damascus, MD [Member]
Debt Instrument [Line Items]
Debt Instrument, collateral amount													25,438,000
Escrow released													1,850,000
Fixed rate mortgage loans													18,824,000	19,354,000
Mortgages [Member] \| Middletown, NY Mortgage [Member]
Debt Instrument [Line Items]
Fixed rate mortgage loans													15,255,000	$ 15,588,000
Mortgages [Member] \| Frederick, MD [Member]
Debt Instrument [Line Items]
Debt Instrument, collateral amount													12,528,000
Mortgages [Member] \| Westwood Hills Property [Member]
Debt Instrument [Line Items]
Refinanced loan amount						$ 25,000,000
Basis points, interest rate						400.00%
Loan amount													8,537,000
Maturity date of loan						Oct. 01, 2022
Fixed rate mortgage loans						$ 19,200,000
Legal fees						$ 250,000
Mortgages [Member] \| Westwood Hills Property [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Fixed interest rate on old loan						4.62%
Fixed rate mortgage loans						$ 5,600,000
Mortgages [Member] \| Westwood Hills Property [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Fixed interest rate on old loan						4.15%
Fixed rate mortgage loans						$ 2,200,000
Mortgages [Member] \| COVID 19 [Member]
Debt Instrument [Line Items]
Deferred Interest													162,100
Deferred payments													303,800
Remaining deferred Amount													$ 141,700
Provident Bank [Member] \| Middletown, NY Mortgage [Member]
Debt Instrument [Line Items]
Basis points, interest rate													1.25%
Fixed interest rate current loan													3.75%
Debt Instrument, collateral amount													$ 18,260,000
Loan amount													$ 16,200,000
Maturity date of loan													Dec. 15, 2024
Monthly principal payment amount													$ 27,807
WestFREIT Corp [Member]
Debt Instrument [Line Items]
Basis points, interest rate		2.40%
Fixed interest rate current loan													2.55%
Debt Instrument, Periodic Payment		$ 47,250
Loan amount		$ 22,500,000
Maturity date of loan		May 01, 2020
Rotunda [Member]
Debt Instrument [Line Items]
Basis points, interest rate													2.85%
Variable interest rate													2.99%
Debt Instrument, collateral amount													$ 140,206,000
Loan amount													$ 118,500,000
Grande Rotunda LLC Construction Loan [Member]
Debt Instrument [Line Items]
Interest rate cap													3.00%
Loan amount													$ 121,900,000
Line of Credit, available													$ 3,380,000