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Investment Securities: (Tables)
3 Months Ended
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
 
March 31, 2015
 
December 31, 2014
Federal tax-exempt debt securities
$
13,760

 
$
15,013

Corporate bonds
24,513

 
46,209

Commercial paper
4,497

 
3,846

Certificates of deposit
3,484

 
5,884

 
$
46,254

 
$
70,952