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OPERATING SEGMENTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Rental and other property revenues $ 31,607 $ 31,587 $ 62,690 $ 63,409
Property operating expenses (15,550) (15,429) (29,974) (31,693)
Interest income 4,882 5,059 9,991 9,852
Gain (loss) on land sales (476) 1,335 (31)
Segment operating (loss) income 3,617 4,828 8,535 9,306
Real estate assets 1,010,244 930,647 1,010,244 930,647
Commercial Properties [Member]        
Segment Reporting Information [Line Items]        
Rental and other property revenues 7,404 8,553 14,959 17,711
Property operating expenses (4,238) (4,900) (7,986) (9,839)
Depreciation (2,323) (2,397) (4,616) (4,699)
Mortgage and loan interest (1,893) (2,121) (3,742) (3,727)
Segment operating (loss) income (1,050) (865) (1,385) (554)
Capital expenditures 2,092 557 2,725 1,932
Real estate assets 135,288 148,718 135,288 148,718
Property Sales        
Sales price 2,313   2,313  
Cost of sale (2,313)   (2,313)  
Apartments [Member]        
Segment Reporting Information [Line Items]        
Rental and other property revenues 24,201 23,030 47,726 45,691
Property operating expenses (11,199) (10,211) (21,782) (20,956)
Depreciation (4,195) (4,030) (8,344) (8,076)
Mortgage and loan interest (5,342) (5,028) (10,798) (11,787)
Segment operating (loss) income 3,465 3,761 6,802 4,872
Capital expenditures       585
Real estate assets 762,410 654,119 762,410 654,119
Property Sales        
Sales price     8,512  
Cost of sale     (8,512)  
Land [Member]        
Segment Reporting Information [Line Items]        
Rental and other property revenues     1  
Property operating expenses (135) (168) (134) (447)
Mortgage and loan interest 65 (389) (130) (1,083)
Gain (loss) on land sales   (476) 1,335 (31)
Segment operating (loss) income (70) (1,033) 1,072 (1,561)
Capital expenditures   186    
Real estate assets 111,899 127,810 111,899 127,810
Property Sales        
Sales price   507 7,239 1,596
Cost of sale   (983) (5,904) (1,627)
Gain (loss) on sale   (476) 1,335 (31)
Other [Member]        
Segment Reporting Information [Line Items]        
Rental and other property revenues 2 4 4 7
Property operating expenses 22 (150) (72) (451)
Depreciation 14 18 65 36
Mortgage and loan interest (8,737) (9,809) (16,961) (17,546)
Interest income 4,882 5,059 9,991 9,852
Segment operating (loss) income (3,817) (4,878) (6,973) (8,102)
Real estate assets 647   647  
Total Segments [Member]        
Segment Reporting Information [Line Items]        
Rental and other property revenues 31,607 31,587 62,690 63,409
Property operating expenses (15,550) (15,429) (29,974) (31,693)
Depreciation (6,504) (6,409) (12,895) (12,739)
Mortgage and loan interest (15,907) (17,347) (31,631) (34,143)
Interest income 4,882 5,059 9,991 9,852
Gain (loss) on land sales   (476) 1,335 (31)
Segment operating (loss) income (1,472) (3,015) (484) (5,345)
Capital expenditures 2,092 743 2,725 2,517
Real estate assets 1,010,244 930,647 1,010,244 930,647
Property Sales        
Sales price 2,313 507 18,064 1,596
Cost of sale $ (2,313) (983) (16,729) (1,627)
Gain (loss) on sale   $ (476) $ 1,335 $ (31)