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Note 9 - Cash, Cash Equivalents, Investments and Restricted Cash - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Continuous Unrealized Loss Position, 12 Months or Longer | $ 74 | $ 6,860
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1) | (69)
Auction Rate Securities [Member] |  |
Continuous Unrealized Loss Position, 12 Months or Longer | 74 | 148
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ (1) | (2)
US Government Agencies Short-Term Debt Securities [Member] |  |
Continuous Unrealized Loss Position, 12 Months or Longer |  | 6,712
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | $ (67)

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