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5. Other Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Other Assets [Abstract]  
Other assets consist
    2015     2014  
Deposit with Trustee of 6 1/2%            
  debentures   $ 41,000     $ 48,000  
Prepaid expenses     2,000       2,000  
Deferred charges     1,000       1,000  
    $ 44,000     $ 51,000