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Investment in Available-for-Sale Securities (Tables)
 12 Months Ended
Dec. 31, 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 investment in available-for-sale securities as of December 31, 2012:

 

    Cost     Unrealized Gains     Unrealized
Losses		     Fair Value  
U.S. federal agency securities   $ 19,592     $ 196     $ -     $ 19,788  
Municipal securities     1,154,888       2,882       (2,137 )     1,155,633  
Certificates of deposit     1,193,494       8,734       (16,904 )     1,185,324  
Corporate debt securities     285,524       4,164       (9,633 )     280,055  
Equity securities – ClearSign common stock     7,905       9,485       -       17,390  
    $ 2,661,403     $ 25,461     $ (28,674 )   $ 2,658,190  

 

The following is a summary of the Company’s investment 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  
Corporate debt securities     1,725,402       11,154       (13,970 )     1,722,586  
Certificates of deposit     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 investment in fixed income available-for-sale debt securities, by contractual maturity, as of December 31, 2012, are as follows:

 

    Cost     Fair
 Value		  
Due within one year   $ 684,032     $ 661,329  
Due after one year through three years     731,410       733,771  
Due after three years     1,238,056       1,245,700  
    $ 2,653,498     $ 2,640,800