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Investment Securities: (Tables)
12 Months Ended
Dec. 31, 2014
Investment Securities [Abstract]  
Available-for-sale Securities [Table Text Block]
 
 
2014
 
2013
Federal and municipal tax-exempt debt securities
 
$
15,013

 
$
21,968

Corporate bonds
 
46,209

 
45,696

Commercial paper
 
3,846

 

Certificates of deposit
 
5,884

 
3,205

 
 
$
70,952

 
$
70,869