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Marketable Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2018
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 September 30, 2018 and December 31, 2017 were as follows:
 
September 30, 2018
 
Amortized
Cost
 
 
Gross
unrealized
holding
gains
 
 
Gross
unrealized
holding
losses
 
 
Aggregate
fair value
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Government bonds and notes
 
$
1,994,757
 
 
$
-
 
 
$
(447
)
 
$
1,994,310
 
Corporate bonds, notes and 
commercial paper
 
 
10,086,112
 
 
 
-
 
 
 
(3,406
)
 
 
10,082,706
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
$
12,080,869
 
 
$
-
 
 
$
(3,853
)
 
$
12,077,016
 
 
December 31, 2017
 
Amortized
Cost
 
 
Gross
unrealized
holding
gains
 
 
Gross
unrealized
holding
losses
 
 
Aggregate
fair value
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Government bonds and notes
 
$
4,744,566
 
 
$
-
 
 
$
(2,876
)
 
$
4,741,690
 
Corporate bonds, notes and 
commercial paper
 
 
13,517,371
 
 
 
-
 
 
 
(1,740
)
 
 
13,515,631
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
$
18,261,937
 
 
$
-
 
 
$
(4,616
)
 
$
18,257,321
 
Schedule Of Available For Sale Securities Debt Maturities [Table Text Block]
Maturities of debt securities classified as available-for-sale securities at September 30, 2018 are as follows:
 
September 30, 2018
 
Amortized
Cost
 
 
Aggregate
fair value
 
Due within one year
 
$
12,080,869
 
 
$
12,077,016