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Marketable Investment Securities (Tables)
12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at December 31, 2016 and 2015 were as follows:
 
 
 
 
 
Gross
 
Gross
 
 
 
 
 
 
 
unrealized
 
unrealized
 
 
 
 
 
Amortized
 
holding
 
holding
 
Aggregate
 
December 31, 2016
 
Cost
 
gains
 
losses
 
fair value
 
 
 
 
 
 
 
 
 
 
 
Government bonds and notes
 
$
7,473,273
 
$
-
 
$
(2,219)
 
$
7,471,054
 
Corporate bonds, notes and commercial paper
 
 
13,814,790
 
 
-
 
 
(6,274)
 
 
13,808,516
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
$
21,288,063
 
$
-
 
$
(8,493)
 
$
21,279,570
 
 
 
 
 
 
Gross
 
Gross
 
 
 
 
 
 
 
unrealized
 
unrealized
 
 
 
 
 
Amortized
 
holding
 
holding
 
Aggregate
 
December 31, 2015
 
Cost
 
gains
 
losses
 
fair value
 
 
 
 
 
 
 
 
 
 
 
Government bonds and notes
 
$
802,862
 
$
-
 
$
(750)
 
$
802,112
 
Corporate bonds, notes and commercial paper
 
 
24,005,458
 
 
594
 
 
(32,744)
 
 
23,973,308
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
$
24,808,320
 
$
594
 
$
(33,494)
 
$
24,775,420
 
Schedule Of Available For Sale Securities Debt Maturities [Table Text Block]
Maturities of debt securities classified as available-for-sale securities at December 31, 2016 are as follows:
 
 
 
Amortized
 
Aggregate
 
 
 
Cost
 
fair value
 
Due within one year
 
$
21,288,063
 
$
21,279,570
 
 
 
$
21,288,063
 
$
21,279,570