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Note 4 - Financial Instruments
 12 Months Ended
Dec. 31, 2011
Financial Instruments [Abstract]  
Financial Instruments Disclosure [Text Block]
Financial Instruments

Cash equivalents as of December 31, 2011 and 2010 consisted mainly of $3.2 billion and $2.7 billion of money market funds, respectively. For money market funds, the cost basis equals fair value and, accordingly, there are no unrealized gains or losses. Investment income from these securities was $4.8 million, $4.3 million and $6.2 million in 2011, 2010 and 2009, respectively, and is presented in Interest income and other in our consolidated statements of income.

The following tables summarize our available-for-sale securities as of December 31, 2011. We did not own any available-for-sale securities as of December 31, 2010.

 
 
December 31, 2011
(In thousands)
 
Adjusted Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Assets:
 
 
 
 
 
 
 
 
  U.S. treasury securities
 
$
6,199

 
$
—

 
$
—

 
$
6,199

  U.S. agency securities
 
41,167

 
11

 
(7
)
 
41,171

Non-U.S. government securities
 
8,221

 
—

 
(8
)
 
8,213

  Municipal bond
 
754

 
—

 
(1
)
 
753

Corporate securities
 
100,414

 
84

 
(230
)
 
100,268

Total available-for-sale securities
 
$
156,755

 
$
95

 
$
(246
)
 
$
156,604


    
The adjusted cost and estimated fair value of marketable debt securities (corporate bonds, municipal bonds, U.S. and foreign government securities, and U.S. treasury securities) as of December 31, 2011, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.

 
 
December 31, 2011
(In thousands)
 
Adjusted Cost
 
Estimated Fair Value
Due in one year or less
 
$
82,593

 
$
82,571

Due after one year through five years
 
74,162

 
74,033

 
 
$
156,755

 
$
156,604