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E. Notes Receivable (Tables)
12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Notes Receivable

      Interest            
      Rate   2020  2019
 American Realty Investors, Inc. (a related party) receivable upon maturity               
 in September 2021   6%  $3,631   $4,005 
 Third Party receivable payable monthly and  matures in July 2025    6%   205    255 
        3,836    4,260 
 less: current portion of notes receivable         3,683    4,046 
 Notes Receivable        $153   $214