OPERATING SEGMENTS (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	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, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Operating revenue	$ 24,857	$ 33,409	$ 31,607	$ 31,083	$ 31,005	$ 31,807	$ 31,587	$ 31,822	$ 29,557	$ 30,067	$ 30,834	$ 29,205	$ 120,956	$ 126,221	$ 119,663
Operating expenses													(59,587)	(64,091)	(62,950)
Interest income													21,645	18,941	20,453
Gain on sale of income-producing properties														16,698	16,207
Gain on land sales	3,826	12,243		1,335	3,853	1,062	(476)	445	(805)	555	1,719	1,652	17,404	4,884	3,121
Segment operating income (loss)	140	$ 5,210	$ 3,617	$ 4,918	2,713	$ 5,410	$ 4,828	$ 4,477	2,893	$ 3,795	$ 4,622	$ 3,324	13,885	17,428	14,634
Assets	381,043				988,117								381,043	988,117
Property Sales
Gain on land sales														16,698	16,207
Commercial Properties [Member]
Segment Reporting Information [Line Items]
Operating revenue													33,113	33,286	33,026
Operating expenses													(16,252)	(18,549)	(20,398)
Depreciation and amortization													(9,530)	(9,358)	(9,099)
Mortgage and loan interest													(7,663)	(7,527)	(7,191)
Interest income
Gain on sale of income-producing properties														2,391	(238)
Gain on land sales
Segment operating income (loss)													(332)	243	(3,900)
Capital expenditures													8,246	(5,817)	5,008
Assets	153,014				137,157				150,838				153,014	137,157	150,838
Property Sales
Sales price														5,050
Cost of sale														(2,659)	1,500
Recognized prior deferred gain															(1,738)
Gain on land sales														2,391	(238)
Apartments [Member]
Segment Reporting Information [Line Items]
Operating revenue													87,832	92,807	86,603
Operating expenses													(42,134)	(43,677)	(40,786)
Depreciation and amortization													(13,140)	(16,354)	(14,759)
Mortgage and loan interest													(20,671)	(22,347)	(25,381)
Interest income
Gain on sale of income-producing properties														12,760	16,445
Gain on land sales
Segment operating income (loss)													11,887	23,189	22,122
Capital expenditures													16,953	1,402	864
Assets	143,500				727,508				622,061				143,500	727,508	622,061
Property Sales
Sales price
Cost of sale															20,350
Recognized prior deferred gain														12,760	(3,905)
Gain on land sales														12,760	16,445
Land [Member]
Segment Reporting Information [Line Items]
Operating revenue													1	111	30
Operating expenses													(645)	(878)	(1,745)
Depreciation and amortization
Mortgage and loan interest													(636)	(1,945)	(2,232)
Interest income
Gain on sale of income-producing properties														1,547
Gain on land sales													17,404	4,884	3,121
Segment operating income (loss)													16,124	3,719	(826)
Capital expenditures														609	268
Assets	84,529				123,452				128,107				84,529	123,452	128,107
Property Sales
Sales price													43,311	29,969
Cost of sale													(25,907)	(23,538)	29,128
Recognized prior deferred gain															(26,007)
Gain on land sales													17,404	6,431	3,121
Other [Member]
Segment Reporting Information [Line Items]
Operating revenue													10	17	4
Operating expenses													(556)	(987)	(21)
Depreciation and amortization														33	73
Mortgage and loan interest													(37,093)	(34,352)	(24,558)
Interest income													21,645	18,941	20,453
Gain on sale of income-producing properties
Gain on land sales
Segment operating income (loss)													(15,994)	(16,348)	(4,049)
Capital expenditures
Assets
Property Sales
Sales price
Cost of sale
Recognized prior deferred gain
Gain on land sales
Total Segment [Member]
Segment Reporting Information [Line Items]
Operating revenue													120,956	126,221	119,663
Operating expenses													(59,587)	(64,091)	(62,950)
Depreciation and amortization													(22,670)	(25,679)	(23,785)
Mortgage and loan interest													(66,063)	(66,171)	(59,362)
Interest income													21,645	18,941	20,453
Gain on sale of income-producing properties														16,698	16,207
Gain on land sales													17,404	4,884	3,121
Segment operating income (loss)													11,685	10,803	13,347
Capital expenditures													25,199	(3,806)	6,140
Assets	$ 381,043				$ 988,117				$ 901,006				381,043	988,117	901,006
Property Sales
Sales price													43,311	35,019
Cost of sale													(25,907)	(26,197)	50,978
Recognized prior deferred gain														12,760	(31,650)
Gain on land sales													$ 17,404	$ 21,582	$ 19,328