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Investment in Available-for-Sale Securities
 6 Months Ended
Jun. 30, 2016
Available-For-Sale Securities [Abstract]  
Available For Sale Securities Disclosure [Text Block]
4.  Investment in Available-for-Sale Securities
 
The following is a summary of the Company’s investments in available-for-sale securities as of June 30, 2016 (unaudited):
 
 
 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair Value
 
U.S. federal agency securities
 
$
4,875
 
$
73
 
$
-
 
$
4,948
 
Municipal securities
 
 
403,138
 
 
2,849
 
 
(98)
 
 
405,889
 
Certificates of deposit
 
 
947,697
 
 
26,293
 
 
(10,793)
 
 
963,197
 
Corporate debt securities
 
 
16,921
 
 
199
 
 
-
 
 
17,120
 
 
 
$
1,372,631
 
$
29,414
 
$
(10,891)
 
$
1,391,154
 
 
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 June 30, 2016 (unaudited), are as follows:
 
 
 
Cost
 
Fair
Value
 
Due within one year
 
$
975,209
 
$
987,632
 
Due after one year through three years
 
 
220,371
 
 
222,476
 
Due after three years
 
 
177,051
 
 
181,046
 
 
 
$
1,372,631
 
$
1,391,154
 
 
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.