NOTES AND INTEREST RECEIVABLE (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accrued interest		$ 11,165
Allowance for estimated losses		(14,269)
Total notes receivable		126,058	$ 112,095	$ 126,564	$ 137,280
Performing Loans [Member]
Performing loans, total		$ 140,327
Performing Loans [Member] | H198, LLC (Las Vegas Land) [Member]
Maturity Date		Jan. 31, 2020
Description of property		H198, LLC (Las Vegas Land)
Interest Rate		12.00%
Performing loans, total		$ 5,907
Description of Security		Secured
Performing Loans [Member] | H198, LLC (Legacy at Pleasant Grove Land) [Member]
Maturity Date		Oct. 31, 2019
Description of property		H198, LLC (Legacy at Pleasant Grove Land)
Interest Rate		12.00%
Performing loans, total		$ 496
Description of Security		Secured
Performing Loans [Member] | Oulan-Chikh Family Trust [Member]
Maturity Date		Mar. 31, 2021
Description of property		Oulan-Chikh Family Trust
Interest Rate		8.00%
Performing loans, total		$ 174
Description of Security		Secured
Performing Loans [Member] | H198, LLC (McKinney Ranch Land) [Member]
Maturity Date		Sep. 30, 2020
Description of property		H198, LLC (McKinney Ranch Land
Interest Rate		6.00%
Performing loans, total		$ 4,554
Description of Security		Secured
Performing Loans [Member] | Forest Pines [Member]
Maturity Date		Sep. 30, 2019
Description of property		Forest Pines
Interest Rate		5.00%
Performing loans, total		$ 2,223
Description of Security		Secured
Performing Loans [Member] | Spyglass Apartments of Ennis, LP [Member]
Maturity Date		Nov. 30, 2019
Description of property		Spyglass Apartments of Ennis, LP
Interest Rate		5.00%
Performing loans, total		$ 5,083
Description of Security		Secured
Performing Loans [Member] | Bellwether Ridge [Member]
Maturity Date		May 30, 2020
Description of property		Bellwether Ridge
Interest Rate		5.00%
Performing loans, total		$ 3,429
Description of Security		Secured
Performing Loans [Member] | Parc at Windmill Farms [Member]
Maturity Date		May 30, 2020
Description of property		Parc at Windmill Farms
Interest Rate		5.00%
Performing loans, total		$ 6,066
Description of Security		Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Echo Station) [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property		Unified Housing Foundation, Inc. (Echo Station)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 1,481
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Inwood on the Park) [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property		Unified Housing Foundation, Inc. (Inwood on the Park)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 3,639
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Kensington Park) [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property		Unified Housing Foundation, Inc. (Kensington Park)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 3,933
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Lakeshore Villas) [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property		Unified Housing Foundation, Inc. (Lakeshore Villas)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 2,000
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Lakeshore Villas) [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property		Unified Housing Foundation, Inc. (Lakeshore Villas)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 6,369
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Lakeshore Villas) [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property	[1]	Unified Housing Foundation, Inc. (Lakeshore Villas)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 2,732
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Limestone Ranch) [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property		Unified Housing Foundation, Inc. (Limestone Ranch)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 1,953
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Limestone Ranch) [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property		Unified Housing Foundation, Inc. (Limestone Ranch)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 2,000
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Limestone Ranch) [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property	[1]	Unified Housing Foundation, Inc. (Limestone Ranch)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 4,000
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Reserve at White Rock Phase I) [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property		Unified Housing Foundation, Inc. (Reserve at White Rock Phase I)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 2,485
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Reserve at White Rock Phase II) [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property		Unified Housing Foundation, Inc. (Reserve at White Rock Phase II)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 2,555
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Timbers of Terrell) [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property		Unified Housing Foundation, Inc. (Timbers of Terrell)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 1,323
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Tivoli) [Member]
Maturity Date	[1]	Dec. 31, 2018
Description of property		Unified Housing Foundation, Inc. (Tivoli)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 6,140
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. (Trails at White Rock) [Member]
Maturity Date	[1]	Dec. 31, 2018
Description of property		Unified Housing Foundation, Inc. (Trails at White Rock)
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 3,815
Description of Security	[1]	Secured
Performing Loans [Member] | Unified Housing Foundation, Inc. #4 [Member]
Maturity Date	[1]	Dec. 31, 2019
Description of property	[1]	Unified Housing Foundation, Inc.
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 10,401
Description of Security	[1]	Unsecured
Performing Loans [Member] | Unified Housing Foundation, Inc. #3 [Member]
Maturity Date	[1]	Jun. 30, 2020
Description of property		Unified Housing Foundation, Inc.
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 11,074
Description of Security	[1]	Unsecured
Performing Loans [Member] | One Realco Corp [Member]
Maturity Date	[1],[2]	Jan. 31, 2020
Description of property		One Realco Corporation
Interest Rate	[1],[2]	3.00%
Performing loans, total	[1],[2]	$ 7,000
Description of Security	[1],[2]	Unsecured
Performing Loans [Member] | Realty Advisors Mgmt [Member]
Maturity Date	[1]	Dec. 31, 2024
Description of property		Realty Advisors Management, Inc.
Interest Rate	[1]	2.28%
Performing loans, total	[1]	$ 20,390
Description of Security	[1]	Unsecured
Performing Loans [Member] | Unified Housing Foundation, Inc. #5 [Member]
Maturity Date	[1]	Dec. 31, 2032
Description of property	[1]	Unified Housing Foundation, Inc.
Interest Rate	[1]	12.00%
Performing loans, total	[1]	$ 11,074
Description of Security	[1]	Unsecured
Performing Loans [Member] | Other Related Party Notes #1 [Member]
Description of property		Other related party notes
Description of Interest Rate		Various
Performing loans, total		$ 2,890
Description of Security		Various secured interests
Performing Loans [Member] | Other Non-Related Party Notes #1 [Member]
Description of property		Other non-related party notes
Description of Interest Rate		Various
Performing loans, total		$ 1,031
Description of Security		Various secured interests
Performing Loans [Member] | Other Non-Related Party Notes #2 [Member]
Description of property		Other non-related party notes
Description of Interest Rate		Various
Performing loans, total		$ 2,670
Description of Security		Various unsecured interests

[1] Related party notes

[2] An allowance was taken for estimated losses at full value of note.