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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

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