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D. Notes Receivable (Tables)
12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Notes Receivable [Table Text Block]

   Interest      
   Rate  2019  2018
          
 American Realty Investors, Inc. (a related party) payable upon maturity               
 in September 2019   6%  $4,005   $4,017 
 Third Party payable monthly matures in July 2025   6%   255    297 
         4,260    4,314 
                
 less: current portion of notes receivable        4,046    4,063 
                
 Notes Receivable       $214   $251