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NOTES AND INTEREST RECEIVABLE (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Allowance for estimated losses $ (15,770)    
Total notes receivable 126,507 $ 112,095 $ 106,874
Performing Loans [Member]      
Performing loans, total 142,277    
Accrued interest $ 11,108    
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] | Leman Development, Ltd [Member]      
Description of property [1]

Leman Development, Ltd

    
Interest Rate [1] 0.00%    
Performing loans, total [1] $ 1,500    
Description of Security [1]

Unsecured

    
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, 2018    
Description of property

H198, LLC (McKinney Ranch Land)

    
Interest Rate 6.00%    
Performing loans, total $ 4,554    
Description of Security

Secured

    
Performing Loans [Member] | 2818 Ventures LLC (Forest Pines) [Member]      
Maturity Date Nov. 30, 2018    
Description of property

2818 Ventures LLC (Forest Pines)

    
Interest Rate 5.00%    
Performing loans, total $ 2,223    
Description of Security

Secured

    
Performing Loans [Member] | ABC Land & Development (Mandahl Bay) [Member]      
Maturity Date May 31, 2038    
Description of property

ABC Land & Development (Mandahl Bay)

    
Interest Rate 6.00%    
Performing loans, total $ 1,735    
Description of Security

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. (Echo Station) [Member]      
Maturity Date [2] Dec. 31, 2032    
Description of property [2]

Unified Housing Foundation, Inc. (Echo Station)

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 1,481    
Description of Security [2]

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. (Inwood on the Park) [Member]      
Maturity Date [2] Dec. 31, 2032    
Description of property [2]

Unified Housing Foundation, Inc. (Inwood on the Park)

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 3,639    
Description of Security [2]

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. (Kensington Park) [Member]      
Maturity Date [2] Dec. 31, 2032    
Description of property [2]

Unified Housing Foundation, Inc. (Kensington Park)

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 3,933    
Description of Security [2]

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. (Lakeshore Villas) [Member]      
Maturity Date [2] Dec. 31, 2032    
Description of property [2]

Unified Housing Foundation, Inc. (Lakeshore Villas)

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 2,000    
Description of Security [2]

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. (Lakeshore Villas) [Member]      
Maturity Date [2] Dec. 31, 2032    
Description of property [2]

Unified Housing Foundation, Inc. (Lakeshore Villas)

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 9,101    
Description of Security [2]

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. (Limestone Ranch) [Member]      
Maturity Date [2] Dec. 31, 2032    
Description of property [2]

Unified Housing Foundation, Inc. (Limestone Ranch)

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 1,953    
Description of Security [2]

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. (Limestone Ranch) [Member]      
Maturity Date [2] Dec. 31, 2032    
Description of property [2]

Unified Housing Foundation, Inc. (Limestone Ranch)

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 6,000    
Description of Security [2]

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. (Reserve at White Rock Phase I) [Member]      
Maturity Date [2] Dec. 31, 2032    
Description of property [2]

Unified Housing Foundation, Inc. (Reserve at White Rock Phase I)

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 2,485    
Description of Security [2]

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. (Reserve at White Rock Phase II) [Member]      
Maturity Date [2] Dec. 31, 2032    
Description of property [2]

Unified Housing Foundation, Inc. (Reserve at White Rock Phase II)

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 2,555    
Description of Security [2]

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. (Timbers of Terrell) [Member]      
Maturity Date [2] Dec. 31, 2032    
Description of property [2]

Unified Housing Foundation, Inc. (Timbers of Terrell)

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 1,323    
Description of Security [2]

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. (Tivoli) [Member]      
Maturity Date [2] Dec. 31, 2032    
Description of property [2]

Unified Housing Foundation, Inc. (Tivoli)

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 7,965    
Description of Security [2]

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. (Trails at White Rock) [Member]      
Maturity Date [2] Dec. 31, 2032    
Description of property [2]

Unified Housing Foundation, Inc. (Trails at White Rock)

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 3,815    
Description of Security [2]

Secured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. #1 [Member]      
Maturity Date [2] Dec. 31, 2018    
Description of property [2]

Unified Housing Foundation, Inc.

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 3,994    
Description of Security [2]

Unsecured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. #2 [Member]      
Maturity Date [2] Dec. 31, 2018    
Description of property [2]

Unified Housing Foundation, Inc.

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 6,407    
Description of Security [2]

Unsecured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. #3 [Member]      
Maturity Date [2] Jun. 30, 2020    
Description of property [2]

Unified Housing Foundation, Inc.

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 5,760    
Description of Security [2]

Unsecured

    
Performing Loans [Member] | Unified Housing Foundation, Inc. #4 [Member]      
Maturity Date [2] Mar. 31, 2021    
Description of property [2]

Unified Housing Foundation, Inc.

    
Interest Rate [2] 12.00%    
Performing loans, total [2] $ 5,314    
Description of Security [2]

Unsecured

    
Performing Loans [Member] | One Realco Corp [Member]      
Maturity Date [1],[2] Jan. 31, 2020    
Description of property [1],[2]

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 [2] Dec. 31, 2019    
Description of property [2]

Realty Advisors Management, Inc.

    
Interest Rate [2] 2.28%    
Performing loans, total [2] $ 20,387    
Description of Security [2]

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 $ 1,349    
Description of Security

Various secured interests

    
Performing Loans [Member] | Other Related Party Notes #2 [Member]      
Description of property

Other related party notes

    
Description of Interest Rate Various    
Performing loans, total $ 510    
Description of Security Various unsecured 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 $ 3,466    
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 $ 14,639    
Description of Security Various unsecured interests

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