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Investments in Available-for-Sale Securities (Tables)
 6 Months Ended
Jun. 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 securities as of June 30, 2012:

 

    Cost     Unrealized
Gains		     Unrealized
Losses		     Fair Value  
U.S. federal agency securities   $ 19,615     $ 341     $ -     $ 19,956  
Municipal securities     231,400       -       (36 )     231,364  
Certificates of deposit     1,757,013       7,667       (10,188 )     1,754,492  
Corporate debt securities     624,287       2,613       (29,562 )     597,338  
Equity securities     7,905       16,456       -       24,361  
    $ 2,640,220     $ 27,077     $ (39,786 )   $ 2,627,511  

 

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 June 30, 2012, were as follows:

 

    Cost     Fair Value  
Due within one year   $ 1,525,705     $ 1,499,585  
Due after one year through three years     499,798       489,559  
Due after three years     606,812       614,006  
No maturity     7,905       24,361  
    $ 2,640,220     $ 2,627,511