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Investment Securities: (Tables)
6 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
 
June 30, 2015
 
December 31, 2014
Federal tax-exempt debt securities
$
10,999

 
$
15,013

Corporate bonds
18,003

 
46,209

Commercial paper
3,986

 
3,846

Certificates of deposit
3,235

 
5,884

 
$
36,223

 
$
70,952