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Investments in Available-for-Sale Securities (Tables)
 9 Months Ended
Sep. 30, 2012
Available-For-Sale Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

The following is a summary of the Company’s investments in available-for-sale fixed-income securities as of September 30, 2012:

 

  Cost     Unrealized
Gains		     Unrealized
Losses		     Fair Value  
U.S. federal agency securities   $ 19,604     $ 295     $ -     $ 19,899  
Municipal securities     59,619       -       (60 )     59,559  
Certificates of deposit     1,200,163       8,346       (13,657 )     1,194,852  
Corporate debt securities     751,540       3,624       (34,227 )     720,937  
Equity securities – ClearSign common stock     7,905       17,390       -       25,295  
    $ 2,038,831     $ 29,655     $ (47,944 )   $ 2,020,542  

 

The following is a summary of the Company’s investments in available-for-sale securities as of December 31, 2011:

 

  Cost     Unrealized
Gains		     Unrealized
Losses		     Fair Value  
U.S. federal agency securities   $ 15,153     $ 411     $ -     $ 15,564  
Certificates of deposit     1,725,402       11,154       (13,970 )     1,722,586  
Corporate debt securities     776,244       1,222       (23,843 )     753,623  
    $ 2,516,799     $ 12,787     $ (37,813 )   $ 2,491,773
Available-for-sale Securities [Table Text Block]

The cost and fair value of investments in available-for-sale securities, by contractual maturity, as of September 30, 2012, were as follows:

 

  Cost     Fair Value  
Due within one year   $ 1,551,670     $ 1,505,567  
Due after one year through three years     197,466       200,961  
Due after three years     281,790       288,719  
No maturity     7,905       25,295  
    $ 2,038,831     $ 2,020,542