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4. Investments (Tables)
 9 Months Ended
Sep. 30, 2014
Investments Schedule [Abstract]  
Investments, Held-to-Maturity Securities
          Gross Unrealized        
    Cost     Gains     Losses     Fair Value  
Short-term Investments:                        
Corporate bonds   $ 18,178     $ 36     $ --     $ 18,214  
                                 
Long-term Investments                                
Corporate bonds   $ 10,000     $ --     $ (6 )   $ 9,994