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CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
9 Months Ended
Sep. 30, 2011
Notes to Financial Statements [Abstract] 
CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
3.
CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS

The Company considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. The Company's remaining marketable securities are classified as available-for-sale. These securities are carried at fair market value, with unrealized gains and losses reported in shareholders' equity. Gains or losses on securities sold are based on the specific identification method.

Short-term investments at September 30, 2011 consisted of the following:

   
Amortized
  
Unrealized
  
Aggregate Fair
 
Investment Classification
 
Cost
  
Gains
  
(Losses)
  
Market Value
 
September 30, 2011 -
            
Certificates of deposit
 $5,713,230  $130  $(5,130) $5,708,230 
Corporate bonds
  258,859,623   73,289   (44,850)  258,888,062 
U.S. government bonds
  6,233,885   846   ( 1,851)  6,232,880 
   $270,806,738  $74,265  $(51,831) $270,829,172 

 
Short-term investments at December 31, 2010 consisted of the following:

   
Amortized
  
Unrealized
  
Aggregate Fair
 
Investment Classification
 
Cost
  
Gains
  
(Losses)
  
Market Value
 
December 31, 2010 -
            
Certificates of deposit
 $7,167,818  $62  $(7,919) $7,159,961 
Corporate bonds
  30,423,518   19,964   (642)  30,442,840 
U.S. government bonds
  15,189,511   3,040   (807)  15,191,744 
   $52,780,847  $23,066  $(9,368) $52,794,545 

All short-term investments held at September 30, 2011 will mature within one year.