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Investment Securities (Tables)
12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
(in thousands):
 
 
December 31,
 
 
 
2015
Federal and municipal tax-exempt debt securities
 
 
$
4,951

Corporate bonds
 
 
25,400

U.S. Treasury securities
 
 
7,537

Commercial paper
 
 
2,097

Certificates of deposit
 
 
1,248

 
 
 
$
41,233