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Marketable Investment Securities (Tables)
12 Months Ended
Dec. 31, 2015
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, 2015 were as follows:
 
 
 
 
 
Gross
 
Gross
 
 
 
 
 
 
 
unrealized
 
unrealized
 
 
 
 
 
Amortized
 
holding
 
holding
 
Aggregate
 
 
 
Cost
 
gains
 
losses
 
fair value
 
 
 
 
 
 
 
 
 
 
 
Government notes
 
$
802,862
 
$
-
 
$
(750)
 
$
802,112
 
Corporate bonds and notes
 
 
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]
There were no marketable investment securities held as of December 31, 2014. Maturities of debt securities classified as available-for-sale securities at December 31, 2015 are as follows:
 
 
 
Amortized
 
Aggregate fair
 
 
 
Cost
 
value
 
Due within one year
 
$
24,407,539
 
$
24,375,168
 
Due after one year through five years
 
 
400,781
 
 
400,252
 
Due after five years
 
 
-
 
 
-
 
 
 
$
24,808,320
 
$
24,775,420