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Investment Securities (Tables)
9 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
Our short and long-term investment securities consisted of the following at September 30, 2017 (in thousands):
 
Amortized Cost
 
Unrealized Losses
 
Estimated Fair Value
Short-term corporate bonds
$
9,591

 
$
(16
)
 
$
9,575

Long-term corporate bonds
15,140

 
(86
)
 
15,054

Total investment securities
$
24,731

 
$
(102
)
 
$
24,629