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Investment in Available-for-Sale Securities
 9 Months Ended
Sep. 30, 2016
Available-For-Sale Securities [Abstract]  
Available For Sale Securities Disclosure [Text Block]
5.  Investment in Available-for-Sale Securities
 
The following is a summary of the Company’s investments in available-for-sale securities as of September 30, 2016 (unaudited):
 
 
 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
 
U.S. federal agency securities
 
$
4,898
 
$
53
 
$
-
 
$
4,951
 
Municipal securities
 
 
311,517
 
 
1,582
 
 
(236)
 
 
312,863
 
Certificates of deposit
 
 
741,769
 
 
31,612
 
 
(10,736)
 
 
762,645
 
Corporate debt securities
 
 
16,795
 
 
216
 
 
-
 
 
17,011
 
 
 
$
1,074,979
 
$
33,463
 
$
(10,972)
 
$
1,097,470
 
 
The following is a summary of the Company’s investments in available-for-sale securities as of December 31, 2015:
 
 
 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
 
U.S. federal agency securities
 
$
4,830
 
$
55
 
$
-
 
$
4,885
 
Municipal securities
 
 
492,237
 
 
789
 
 
(980)
 
 
492,046
 
Certificates of deposit
 
 
1,256,649
 
 
20,182
 
 
(14,865)
 
 
1,261,966
 
Corporate debt securities
 
 
17,173
 
 
115
 
 
-
 
 
17,288
 
 
 
$
1,770,889
 
$
21,141
 
$
(15,845)
 
$
1,776,185
 
   
The cost and fair value of investments in fixed income available-for-sale debt securities, by contractual maturity, as of September 30, 2016 (unaudited), are as follows:
 
 
 
Cost
 
Fair
Value
 
Due within one year
 
$
739,361
 
$
757,136
 
Due after one year through three years
 
 
164,331
 
 
165,934
 
Due after three years
 
 
171,287
 
 
174,400
 
 
 
$
1,074,979
 
$
1,097,470
 
 
Expected maturities will differ from contractual maturities because the issuers of certain debt securities have the right to call or prepay their obligations without any penalties.  The Company has classified the entire fair value of its investments in available-for-sale debt securities as current assets in the accompanying condensed balance sheets.