SCHEDULE III - REAL ESTATE PROPERTIES AND ACCUMULATED DEPRECIATION (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2018 USD ($)
Real estate properties and accumulated depreciation
Encumbrances	$ 798,805
Initial Cost to Company
Land	166,099
Buildings and Improvements	871,448
Costs Capitalized Subsequent to Acquisition
Land	228
Improvements	112,283
Carrying Costs	318
Gross Amount At Which Carried at September 30, 2018
Land	163,862
Buildings and Improvements	984,049
Total	1,147,911
Accumulated Depreciation	88,109
Commercial | Yonkers, NY
Real estate properties and accumulated depreciation
Encumbrances	1,329
Initial Cost to Company
Land	0
Buildings and Improvements	4,000
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	320
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	0
Buildings and Improvements	4,320
Total	4,320
Accumulated Depreciation	$ 1,948
Depreciation Life For Latest Income Statement	39 years
Commercial | South Daytona, FL
Real estate properties and accumulated depreciation
Encumbrances	$ 0
Initial Cost to Company
Land	10,437
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Land	49
Improvements	0
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	8,021
Buildings and Improvements	0
Total	8,021
Accumulated Depreciation	0
Multi-family residential | North Charleston, SC
Real estate properties and accumulated depreciation
Encumbrances	16,443
Initial Cost to Company
Land	2,436
Buildings and Improvements	18,970
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,185
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	2,436
Buildings and Improvements	20,155
Total	22,591
Accumulated Depreciation	$ 4,295
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Decatur, GA
Real estate properties and accumulated depreciation
Encumbrances	$ 14,837
Initial Cost to Company
Land	1,698
Buildings and Improvements	8,676
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,683
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	1,698
Buildings and Improvements	10,359
Total	12,057
Accumulated Depreciation	$ 2,245
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Houston, TX (Stonecrossing)
Real estate properties and accumulated depreciation
Encumbrances	$ 12,410
Initial Cost to Company
Land	5,143
Buildings and Improvements	11,524
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	493
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	5,143
Buildings and Improvements	12,017
Total	17,160
Accumulated Depreciation	$ 2,397
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Houston, TX (Stonecrossing East)
Real estate properties and accumulated depreciation
Encumbrances	$ 7,137
Initial Cost to Company
Land	3,044
Buildings and Improvements	5,463
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,031
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	3,044
Buildings and Improvements	6,494
Total	9,538
Accumulated Depreciation	$ 1,256
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Huntsville, AL
Real estate properties and accumulated depreciation
Encumbrances	$ 11,886
Initial Cost to Company
Land	1,047
Buildings and Improvements	10,942
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	873
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	1,047
Buildings and Improvements	11,815
Total	12,862
Accumulated Depreciation	$ 2,167
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Columbus, OH
Real estate properties and accumulated depreciation
Encumbrances	$ 9,741
Initial Cost to Company
Land	1,372
Buildings and Improvements	12,678
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	493
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	1,372
Buildings and Improvements	13,171
Total	14,543
Accumulated Depreciation	$ 2,463
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Indianapolis, IN
Real estate properties and accumulated depreciation
Encumbrances	$ 14,156
Initial Cost to Company
Land	4,477
Buildings and Improvements	14,240
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	2,749
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	4,477
Buildings and Improvements	16,989
Total	21,466
Accumulated Depreciation	$ 2,966
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Nashville, TN
Real estate properties and accumulated depreciation
Encumbrances	$ 22,721
Initial Cost to Company
Land	4,565
Buildings and Improvements	22,054
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	3,107
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	4,565
Buildings and Improvements	25,161
Total	29,726
Accumulated Depreciation	$ 3,850
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Houston, TX (Kendall)
Real estate properties and accumulated depreciation
Encumbrances	$ 14,989
Initial Cost to Company
Land	1,849
Buildings and Improvements	13,346
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	2,143
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	1,849
Buildings and Improvements	15,489
Total	17,338
Accumulated Depreciation	$ 2,495
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Pensacola, FL
Real estate properties and accumulated depreciation
Encumbrances	$ 18,931
Initial Cost to Company
Land	2,758
Buildings and Improvements	25,192
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	611
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	2,758
Buildings and Improvements	25,803
Total	28,561
Accumulated Depreciation	$ 3,606
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | San Marcos, TX
Real estate properties and accumulated depreciation
Encumbrances	$ 17,158
Initial Cost to Company
Land	2,163
Buildings and Improvements	19,562
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	238
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	2,163
Buildings and Improvements	19,800
Total	21,963
Accumulated Depreciation	$ 2,515
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Lake St. Louis, MO
Real estate properties and accumulated depreciation
Encumbrances	$ 26,210
Initial Cost to Company
Land	2,752
Buildings and Improvements	33,248
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,164
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	2,752
Buildings and Improvements	34,412
Total	37,164
Accumulated Depreciation	$ 3,925
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | North Charleston, MO
Real estate properties and accumulated depreciation
Encumbrances	$ 30,266
Initial Cost to Company
Land	5,538
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	35,457
Carrying Costs	318
Gross Amount At Which Carried at September 30, 2018
Land	5,538
Buildings and Improvements	35,775
Total	41,313
Accumulated Depreciation	$ 2,385
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | La Grange, GA
Real estate properties and accumulated depreciation
Encumbrances	$ 15,103
Initial Cost to Company
Land	832
Buildings and Improvements	21,968
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	512
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	832
Buildings and Improvements	22,480
Total	23,312
Accumulated Depreciation	$ 2,379
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Katy, TX
Real estate properties and accumulated depreciation
Encumbrances	$ 30,750
Initial Cost to Company
Land	4,194
Buildings and Improvements	36,056
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	4,054
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	4,194
Buildings and Improvements	40,110
Total	44,304
Accumulated Depreciation	$ 3,556
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Macon, GA
Real estate properties and accumulated depreciation
Encumbrances	$ 11,096
Initial Cost to Company
Land	1,876
Buildings and Improvements	12,649
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	550
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	1,876
Buildings and Improvements	13,199
Total	15,075
Accumulated Depreciation	$ 1,470
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Southaven, MS (Civic Center I)
Real estate properties and accumulated depreciation
Encumbrances	$ 28,000
Initial Cost to Company
Land	2,090
Buildings and Improvements	32,910
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	2,224
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	2,090
Buildings and Improvements	35,134
Total	37,224
Accumulated Depreciation	$ 3,472
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | San Antonio, TX (Location 1)
Real estate properties and accumulated depreciation
Encumbrances	$ 26,189
Initial Cost to Company
Land	5,540
Buildings and Improvements	29,610
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	739
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	5,540
Buildings and Improvements	30,349
Total	35,889
Accumulated Depreciation	$ 3,528
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Dallas, TX
Real estate properties and accumulated depreciation
Encumbrances	$ 27,823
Initial Cost to Company
Land	13,073
Buildings and Improvements	23,927
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	2,758
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	13,073
Buildings and Improvements	26,685
Total	39,758
Accumulated Depreciation	$ 2,594
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Columbia, SC
Real estate properties and accumulated depreciation
Encumbrances	$ 12,934
Initial Cost to Company
Land	2,233
Buildings and Improvements	14,767
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	846
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	2,233
Buildings and Improvements	15,613
Total	17,846
Accumulated Depreciation	$ 1,614
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Atlanta, GA (Location 2)
Real estate properties and accumulated depreciation
Encumbrances	$ 27,375
Initial Cost to Company
Land	10,347
Buildings and Improvements	28,777
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,096
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	10,347
Buildings and Improvements	29,873
Total	40,220
Accumulated Depreciation	$ 3,075
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Southaven, MS (Civic Center II)
Real estate properties and accumulated depreciation
Encumbrances	$ 30,564
Initial Cost to Company
Land	2,077
Buildings and Improvements	36,128
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,208
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	2,077
Buildings and Improvements	37,336
Total	39,413
Accumulated Depreciation	$ 3,473
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | San Antonio, TX (Location 2)
Real estate properties and accumulated depreciation
Encumbrances	$ 27,000
Initial Cost to Company
Land	4,620
Buildings and Improvements	31,380
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	736
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	4,620
Buildings and Improvements	32,116
Total	36,736
Accumulated Depreciation	$ 3,073
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Fredricksburg, VA
Real estate properties and accumulated depreciation
Encumbrances	$ 28,869
Initial Cost to Company
Land	6,985
Buildings and Improvements	32,148
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,012
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	6,985
Buildings and Improvements	33,160
Total	40,145
Accumulated Depreciation	$ 2,677
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | St. Louis, MO (Tower at OPOP)
Real estate properties and accumulated depreciation
Encumbrances	$ 20,000
Initial Cost to Company
Land	192
Buildings and Improvements	27,231
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	133
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	192
Buildings and Improvements	27,364
Total	27,556
Accumulated Depreciation	$ 1,776
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | St. Louis, MO (Lofts at OPOP)
Real estate properties and accumulated depreciation
Encumbrances	$ 6,197
Initial Cost to Company
Land	329
Buildings and Improvements	7,805
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	102
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	329
Buildings and Improvements	7,907
Total	8,236
Accumulated Depreciation	$ 656
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Creve Coeur, MO
Real estate properties and accumulated depreciation
Encumbrances	$ 29,000
Initial Cost to Company
Land	2,270
Buildings and Improvements	37,899
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	123
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	2,270
Buildings and Improvements	38,022
Total	40,292
Accumulated Depreciation	$ 2,352
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | West Nashville, TN
Real estate properties and accumulated depreciation
Encumbrances	$ 18,657
Initial Cost to Company
Land	5,228
Buildings and Improvements	5,220
Costs Capitalized Subsequent to Acquisition
Land	179
Improvements	33,430
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	5,407
Buildings and Improvements	38,650
Total	44,057
Accumulated Depreciation	$ 0
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Farmers Branch, TX
Real estate properties and accumulated depreciation
Encumbrances	$ 55,200
Initial Cost to Company
Land	7,343
Buildings and Improvements	79,347
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	80
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	7,343
Buildings and Improvements	79,427
Total	86,770
Accumulated Depreciation	$ 4,834
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Tallahassee, FL
Real estate properties and accumulated depreciation
Encumbrances	$ 21,524
Initial Cost to Company
Land	3,553
Buildings and Improvements	24,372
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,608
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	3,553
Buildings and Improvements	25,980
Total	29,533
Accumulated Depreciation	$ 1,461
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Madison, AL
Real estate properties and accumulated depreciation
Encumbrances	$ 15,000
Initial Cost to Company
Land	1,936
Buildings and Improvements	16,731
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,076
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	1,936
Buildings and Improvements	17,807
Total	19,743
Accumulated Depreciation	$ 811
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Boerne, TX
Real estate properties and accumulated depreciation
Encumbrances	$ 9,200
Initial Cost to Company
Land	1,393
Buildings and Improvements	10,851
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	319
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	1,393
Buildings and Improvements	11,170
Total	12,563
Accumulated Depreciation	$ 631
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Ocoee, FL
Real estate properties and accumulated depreciation
Encumbrances	$ 53,060
Initial Cost to Company
Land	16,754
Buildings and Improvements	55,641
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	3,197
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	16,754
Buildings and Improvements	58,838
Total	75,592
Accumulated Depreciation	$ 2,494
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Lawrenceville, GA
Real estate properties and accumulated depreciation
Encumbrances	$ 54,447
Initial Cost to Company
Land	17,199
Buildings and Improvements	60,797
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	4,437
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	17,199
Buildings and Improvements	65,234
Total	82,433
Accumulated Depreciation	$ 2,578
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Daytona Beach, FL
Real estate properties and accumulated depreciation
Encumbrances	$ 13,608
Initial Cost to Company
Land	3,501
Buildings and Improvements	17,385
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	480
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	3,501
Buildings and Improvements	17,865
Total	21,366
Accumulated Depreciation	$ 498
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Grand Prairie, TX
Real estate properties and accumulated depreciation
Encumbrances	$ 18,995
Initial Cost to Company
Land	3,255
Buildings and Improvements	27,954
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	16
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2018
Land	3,255
Buildings and Improvements	27,970
Total	31,225
Accumulated Depreciation	$ 594
Depreciation Life For Latest Income Statement	30 years