SUMMARY OF INVESTMENTS IN DEBT AND EQUITY SECURITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity Securities available for sale, Estimated Market Value	$ 185,300
Total Securities Available for Sale, Estimated Market Value	185,250	$ 154,921
Available-for-sale Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Total Securities Available for Sale, Cost	234,675	179,665
Total Securities Available for Sale, Estimated Market Value	$ 185,250	$ 154,921
Government National Mortgage Association [Member] | Available-for-sale Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Modified Pass-Through Mortgage-Backed Securities, Interest Rate/Dividend	6.50%	6.50%
Modified Pass-Through Mortgage-Backed Securities, Number of Shares	500,000	500,000
Modified Pass-Through Mortgage-Backed Securities, Cost	$ 2	$ 3
Modified Pass-Through Mortgage-Backed Securities, Estimated Market Value	2	4
Preferred Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Cost	16,752	8,637
Equity Securities available for sale, Estimated Market Value	13,167	7,309
Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Cost	217,921	171,025
Equity Securities available for sale, Estimated Market Value	$ 172,081	$ 147,608
C B L And Associates Properties Inc [Member] | Series D Preferred Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Interest Rate/Dividend Rate	7.375%	7.375%
Equity securities available for sale, Number of Shares	400,000	200,000
Equity securities available for sale, Cost	$ 7,967	$ 4,808
Equity Securities available for sale, Estimated Market Value	$ 3,444	$ 3,194
C B L And Associates Properties Inc [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares	4,000,000	4,000,000
Equity securities available for sale, Cost	$ 33,525	$ 33,525
Equity Securities available for sale, Estimated Market Value	$ 5,160	$ 15,960
Cedar Realty Trust Inc [Member] | Series B Preferred Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Interest Rate/Dividend Rate	7.25%	7.25%
Equity securities available for sale, Number of Shares	6,000	6,000
Equity securities available for sale, Cost	$ 136	$ 136
Equity Securities available for sale, Estimated Market Value	$ 144	$ 143
Dynex Capital Inc [Member] | Series A Preferred Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Interest Rate/Dividend Rate	8.50%	8.50%
Equity securities available for sale, Number of Shares	10,000	10,000
Equity securities available for sale, Cost	$ 250	$ 250
Equity Securities available for sale, Estimated Market Value	$ 256	$ 254
I Star Financial Inc [Member] | Series D Preferred Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Interest Rate/Dividend Rate	8.00%	8.00%
Equity securities available for sale, Number of Shares	10,000	3,000
Equity securities available for sale, Cost	$ 232	$ 71
Equity Securities available for sale, Estimated Market Value	$ 261	$ 86
I Star Financial Inc [Member] | Series I Preferred Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Interest Rate/Dividend Rate	7.50%	7.50%
Equity securities available for sale, Number of Shares	60,000	41,000
Equity securities available for sale, Cost	$ 1,301	$ 872
Equity Securities available for sale, Estimated Market Value	$ 1,547	$ 1,006
Pennsylvania Real Estate Investment Trust [Member] | Series D Preferred Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Interest Rate/Dividend Rate	6.875%
Equity securities available for sale, Number of Shares	120,000
Equity securities available for sale, Cost	$ 2,150
Equity Securities available for sale, Estimated Market Value	$ 2,431
Pennsylvania Real Estate Investment Trust [Member] | Series B Preferred Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Interest Rate/Dividend Rate	7.375%
Equity securities available for sale, Number of Shares	120,000
Equity securities available for sale, Cost	$ 2,216
Equity Securities available for sale, Estimated Market Value	$ 2,484
Pennsylvania Real Estate Investment Trust [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares	1,800,000	200,000
Equity securities available for sale, Cost	$ 13,443	$ 1,993
Equity Securities available for sale, Estimated Market Value	$ 10,296	$ 1,892
UMH Properties Inc [Member] | Series B Preferred Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Interest Rate/Dividend Rate	8.00%	8.00%
Equity securities available for sale, Number of Shares	100,000	100,000
Equity securities available for sale, Cost	$ 2,500	$ 2,500
Equity Securities available for sale, Estimated Market Value	$ 2,600	$ 2,626
UMH Properties Inc [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares	1,257,000	1,188,000
Equity securities available for sale, Cost	$ 12,935	$ 12,061
Equity Securities available for sale, Estimated Market Value	$ 17,693	$ 18,584
Franklin Street Properties [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares	1,000,000	700,000
Equity securities available for sale, Cost	$ 8,478	$ 6,419
Equity Securities available for sale, Estimated Market Value	$ 8,460	$ 5,593
Industrial Logistics Property Trust [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares	700,000	100,000
Equity securities available for sale, Cost	$ 13,789	$ 2,117
Equity Securities available for sale, Estimated Market Value	$ 14,875	$ 2,301
Kimco Realty Corporation [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares	1,700,000	1,200,000
Equity securities available for sale, Cost	$ 27,937	$ 20,338
Equity Securities available for sale, Estimated Market Value	$ 35,496	$ 20,088
Office Properties Income Trust [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares	659,000
Equity securities available for sale, Cost	$ 37,892
Equity Securities available for sale, Estimated Market Value	$ 20,192
Senior Housing Property Trust [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares	1,100,000	900,000
Equity securities available for sale, Cost	$ 17,871	$ 15,463
Equity Securities available for sale, Estimated Market Value	$ 10,181	$ 15,804
Tanger Factory Outlet R E I T Centers [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares	600,000
Equity securities available for sale, Cost	$ 12,300
Equity Securities available for sale, Estimated Market Value	$ 9,288
V E R E I T Inc [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares	3,500,000	3,100,000
Equity securities available for sale, Cost	$ 27,891	$ 25,016
Equity Securities available for sale, Estimated Market Value	$ 34,230	$ 22,506
Washington Prime Group Inc [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares	1,500,000	1,300,000
Equity securities available for sale, Cost	$ 11,860	$ 10,542
Equity Securities available for sale, Estimated Market Value	$ 6,210	$ 9,490
Government Properties Income Trust [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares		1,580,000
Equity securities available for sale, Cost		$ 26,156
Equity Securities available for sale, Estimated Market Value		$ 17,838
Select Income R E I T [Member] | Common Stock [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Equity securities available for sale, Number of Shares		800,000
Equity securities available for sale, Cost		$ 17,395
Equity Securities available for sale, Estimated Market Value		$ 17,552