v3.22.4
Note 3 - Cash, Cash Equivalents, Investments and Restricted Cash - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Continuous Unrealized Loss Position, Less than 12 Months $ 73,930 $ 293,410
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (975) (1,804)
Continuous Unrealized Loss Position, 12 Months or Longer 211,083 7,161
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (7,247) (122)
Unrealized Loss Position, Total 285,013 300,571
Unrealized Loss Position, Accumulated Loss, Total (8,222) (1,926)
Corporate Debt Securities [Member]    
Continuous Unrealized Loss Position, Less than 12 Months 72,943 285,954
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (973) (1,765)
Continuous Unrealized Loss Position, 12 Months or Longer 202,074 4,760
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (6,988) (3)
Unrealized Loss Position, Total 275,017 290,714
Unrealized Loss Position, Accumulated Loss, Total (7,961) (1,768)
US Treasury and Government Short-Term Debt Securities [Member]    
Continuous Unrealized Loss Position, Less than 12 Months 987  
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2)  
Continuous Unrealized Loss Position, 12 Months or Longer 7,298  
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (200)  
Unrealized Loss Position, Total 8,285  
Unrealized Loss Position, Accumulated Loss, Total (202)  
US Government Agencies Short-Term Debt Securities [Member]    
Continuous Unrealized Loss Position, Less than 12 Months   7,456
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (39)
Continuous Unrealized Loss Position, 12 Months or Longer   0
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0
Unrealized Loss Position, Total   7,456
Unrealized Loss Position, Accumulated Loss, Total   (39)
Auction Rate Securities [Member]    
Continuous Unrealized Loss Position, Less than 12 Months 0 0
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Continuous Unrealized Loss Position, 12 Months or Longer 1,711 2,401
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (59) (119)
Unrealized Loss Position, Total 1,711 2,401
Unrealized Loss Position, Accumulated Loss, Total $ (59) $ (119)