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Note 3 - Cash, Cash Equivalents, and Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
US Treasury Securities [Member] |  |
Amortized cost | $ 12,192 | $ 19,883
Gross unrealized gains | 0 | 1
Gross unrealized losses | (1) | 0
Fair value | 12,191 | 19,884
Money Market Funds [Member] |  |
Amortized cost | 5,660 | 5,113
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 5,660 | 5,113
Cash Equivalents [Member] |  |
Amortized cost | 17,852 | 24,996
Gross unrealized gains | 0 | 1
Gross unrealized losses | (1) | 0
Fair value | 17,851 | 24,997
Cash [Member] |  |
Amortized cost | 3,881 | 3,824
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 3,881 | 3,824
Cash and Cash Equivalents [Member] |  |
Amortized cost | 21,733 | 28,820
Gross unrealized gains | 0 | 1
Gross unrealized losses | (1) | 0
Fair value | 21,732 | 28,821
Us Treasury Securities with Maturity Greater than 90 Days but Less than 1 Year [Member] |  |
Amortized cost | 6,179 | 6,179
Gross unrealized gains | 0 | 0
Gross unrealized losses | (1) | 0
Fair value | 6,178 | 6,179
Marketable Securities [Member] |  |
Amortized cost | 6,179 | 6,179
Gross unrealized gains | 0 | 0
Gross unrealized losses | (1) | 0
Fair value | $ 6,178 | $ 6,179

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