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OPERATING SEGMENTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                              
Total operating revenues $ 31,005 $ 31,807 $ 31,587 $ 31,822 $ 29,557 $ 30,067 $ 30,834 $ 29,205 $ 28,965 $ 27,826 $ 24,241 $ 23,156 $ 126,221 $ 119,663 $ 104,188
Operating expenses                         (64,091) (62,950) (54,002)
Interest income                         18,941 20,453 16,674
Gain on sale of income producing properties (3,938) (12,760) (11,283) (5,168) 244              
Gain on land sales 3,853 1,062 (476) 445 (805) 555 1,719 1,652 13,787 1,958 3,027 2,876 4,884 3,121 21,648
Operating income (loss) 2,713 $ 5,410 $ 4,828 $ 4,477 2,893 $ 3,795 $ 4,622 $ 3,324 (1,631) $ 2,085 $ 3,853 $ 2,001 17,428 14,634 6,308
Assets 988,117       901,006       853,507       988,117 901,006 853,507
Property Sales                              
Gain on sale                         16,698 16,207 735
Commercial Properties [Member]                              
Segment Reporting Information [Line Items]                              
Total operating revenues                         33,286 33,026 30,540
Operating expenses                         (18,549) (20,398) (17,761)
Depreciation and amortization                         (9,358) (9,099) (8,993)
Mortgage and loan interest                         (7,527) (7,191) (6,919)
Gain on sale of income producing properties                         2,391 (238)  
Operating income (loss)                         243 (3,900) (3,133)
Capital expenditures                         (5,817) 5,008 8,133
Assets 137,157       150,838       155,147       137,157 150,838 155,147
Property Sales                              
Sales price                         5,050 1,500  
Cost of sale                         (2,659) (1,738)  
Gain on sale                         2,391 (238)  
Apartments [Member]                              
Segment Reporting Information [Line Items]                              
Total operating revenues                         92,807 86,603 73,543
Operating expenses                         (43,677) (40,786) (34,955)
Depreciation and amortization                         (16,354) (14,759) (12,498)
Mortgage and loan interest                         (22,347) (25,381) (23,699)
Gain on sale of income producing properties                         12,760 16,445  
Operating income (loss)                         23,189 22,122 2,391
Capital expenditures                         1,402 864 506
Assets 727,508       622,061       551,415       727,508 622,061 551,415
Property Sales                              
Sales price                           20,350 11,129
Cost of sale                           (3,905) (10,394)
Recognized prior deferred gain                         12,760    
Gain on sale                         12,760 16,445 735
Land [Member]                              
Segment Reporting Information [Line Items]                              
Total operating revenues                         111 30  
Operating expenses                         (875) (1,745) (1,029)
Mortgage and loan interest                         (1,945) (2,232) (4,694)
Gain on sale of income producing properties                         1,547    
Gain on land sales                         4,884 3,121 21,648
Operating income (loss)                         3,722 (826) 15,925
Capital expenditures                         609 268 2,621
Assets 127,554       128,107       146,945       127,554 128,107 146,945
Property Sales                              
Sales price                         29,969 29,128 107,298
Cost of sale                         (23,538) (26,007) (88,387)
Recognized prior deferred gain                             2,737
Gain on sale                         6,431 3,121 21,648
Other [Member]                              
Segment Reporting Information [Line Items]                              
Total operating revenues                         16 4 105
Operating expenses                         (987) (21) (257)
Depreciation and amortization                         33 73 73
Mortgage and loan interest                         (34,354) (24,558) (17,165)
Interest income                         18,941 20,453 16,674
Operating income (loss)                         (16,351) (4,049) (570)
Property Sales                              
Gain on sale                          
Total Segments [Member]                              
Segment Reporting Information [Line Items]                              
Total operating revenues                         126,220 119,663 104,188
Operating expenses                         (64,088) (62,950) (54,002)
Depreciation and amortization                         (25,679) (23,785) (21,418)
Mortgage and loan interest                         (66,173) (59,362) (52,477)
Interest income                         18,941 20,453 16,674
Gain on sale of income producing properties                         16,698 16,207  
Gain on land sales                         4,884 3,121 21,648
Operating income (loss)                         10,803 13,347 14,613
Capital expenditures                         (3,806) 6,140 11,260
Assets $ 992,219       $ 901,006       $ 853,507       992,219 901,006 853,507
Property Sales                              
Sales price                         35,019 50,978 118,427
Cost of sale                         (26,197) (31,650) (98,781)
Recognized prior deferred gain                         12,760   2,737
Gain on sale                         $ 21,582 $ 19,328 $ 22,383