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10. Investments (Tables)
12 Months Ended
Dec. 31, 2019
Schedule of Investments [Abstract]  
Schedule of debt securities
Debt Securities   

Cost

Basis

    Unrealized Gains    Unrealized Losses    

Fair

Value

 
                     
Corporate Debt Securities  $   $   $   $ 
Land                
Interest accruals                
Total  $   $   $   $