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Investment in Available-for-Sale Securities (Tables)
 12 Months Ended
Dec. 31, 2013
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 December 31, 2013:
 
 
 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
 
U.S. federal agency securities
 
$
90,549
 
$
93
 
$
(277)
 
$
90,365
 
Municipal securities
 
 
735,826
 
 
2,175
 
 
(6)
 
 
737,995
 
Certificates of deposit
 
 
1,539,377
 
 
12,281
 
 
(19,398)
 
 
1,532,260
 
Corporate debt securities
 
 
174,738
 
 
275
 
 
(9,091)
 
 
165,922
 
 
 
$
2,540,490
 
$
14,824
 
$
(28,772)
 
$
2,526,542
 
 
The following is a summary of the Company’s investments 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
 
 
1,154,841
 
 
2,882
 
 
(2,090)
 
 
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
 
 
 
$
2,661,356
 
$
25,461
 
$
(28,627)
 
$
2,658,190
 
Available-for-sale Securities [Table Text Block]
The cost and fair value of investments in fixed income available-for-sale debt securities, by contractual maturity, as of December 31, 2013, are as follows:
 
 
 
Cost
 
Fair
Value
 
Due within one year
 
$
805,714
 
$
797,042
 
Due after one year through three years
 
 
852,260
 
 
859,383
 
Due after three years
 
 
882,516
 
 
870,117
 
 
 
$
2,540,490
 
$
2,526,542