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Note 6 - Marketable Securities (Detail) - Portfolio of Marketable Securities: (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Available-for-sale securities:    
Cost $ 250,088 $ 317,236
Gross unrealized gains 3,184 622
Gross unrealized losses (2,257) (3)
Estimated fair value 251,015 317,855
Cost (51,887) (2,914)
Estimated fair value (51,887) (2,914)
Cost 198,201 314,322
Gross unrealized gains 3,184 622
Gross unrealized losses (2,257) (3)
Estimated fair value 199,128 314,941
Short-term Deposits [Member]
   
Available-for-sale securities:    
Cost 48,596 3,029
Estimated fair value 48,596 3,029
Mutual Funds [Member]
   
Available-for-sale securities:    
Cost 10,368  
Gross unrealized gains 1,452  
Estimated fair value 11,820  
US Treasury Securities [Member]
   
Available-for-sale securities:    
Cost 99,299 309,189
Gross unrealized gains 178 593
Gross unrealized losses   (3)
Estimated fair value 99,477 309,779
Corporate Securities [Member]
   
Available-for-sale securities:    
Cost 20,842  
Gross unrealized gains 1,255  
Gross unrealized losses (1,980)  
Estimated fair value 20,117  
Corporate Obligations [Member]
   
Available-for-sale securities:    
Cost 48,708 1,513
Gross unrealized gains 283 8
Gross unrealized losses (277)  
Estimated fair value 48,714 1,521
Commercial Paper [Member]
   
Available-for-sale securities:    
Cost 22,275  
Gross unrealized gains 16  
Estimated fair value 22,291  
US Government Agencies Debt Securities [Member]
   
Available-for-sale securities:    
Cost   3,505
Gross unrealized gains   21
Estimated fair value   $ 3,526