XML 16 R23.htm IDEA: XBRL DOCUMENT v2.3.0.15
Fair Value Measurements And Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Measurements And Marketable Securities 
Fair Value Measurements
Marketable Debt Securities
Contractual Maturities Of Available For Sale Investments
     September 30,
2011
     December 31,
2010
 

Maturing in one year or less

   $ 4,266,000       $ 313,000   

Maturing after one year through three years

     23,319,000         22,325,000   

Maturing after three years

     7,178,000         2,202,000   
  

 

 

    

 

 

 

Total debt securities - available for sale

   $ 34,763,000       $ 24,840,000