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Fair Value Measurement: (Tables)
3 Months Ended
Mar. 31, 2014
Fair Value Disclosures [Abstract]  
Fair Value, Measurement Inputs, Disclosure [Text Block]
The following table provides the assets and liabilities carried at fair value measured on a recurring basis.
 
 
Fair value measurements at March 31, 2014 using
 
Total carrying
value
 
Quoted prices
in active
markets for
identical
assets (level 1)
 
Significant
other
observable
inputs (level 2)
 
Significant
unobservable
inputs (level 3)
Available for sale securities
$
76,224

 
$
5,540

 
$
70,684

 
$

 
$
76,224

 
$
5,540

 
$
70,684

 
$

 
 
 
Fair value measurements at December 31, 2013 using
 
Total carrying
value
 
Quoted prices
in active
markets for
identical
assets (level 1)
 
Significant
other
observable
inputs (level 2)
 
Significant
unobservable
inputs (level 3)
Available for sale securities
$
70,869

 
$
3,205

 
$
67,664

 
$

 
$
70,869

 
$
3,205

 
$
67,664

 
$