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Note 7 - Investments - Summary of Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Cash and cash equivalents | $ 20,127 | $ 55,408
Amortized cost basis | 35,298 |
Unrealized gains | 1 |
Unrealized losses | (155) |
Fair value | 35,144 |
Total assets at fair value | 35,894 |
Total assets at fair value, unrealized gains | 1 |
Total assets at fair value, unrealized losses | (155) |
Total assets at fair value, fair value | 35,740 |
US Treasury and Government [Member] |  |
Amortized cost basis | 18,991 |
Unrealized gains | 0 |
Unrealized losses | (76) |
Fair value | 18,915 |
Corporate Debt Securities [Member] |  |
Amortized cost basis | 6,548 |
Unrealized gains | 0 |
Unrealized losses | (63) |
Fair value | 6,485 |
Commercial Paper [Member] |  |
Amortized cost basis | 2,014 |
Unrealized gains | 0 |
Unrealized losses | (3) |
Fair value | 2,011 |
Certificates of Deposit [Member] |  |
Amortized cost basis | 7,745 |
Unrealized gains | 1 |
Unrealized losses | (13) |
Fair value | 7,733 |
Money Market Funds [Member] |  |
Cash and cash equivalents | 596 |
Money market funds, unrealized gains | 0 |
Money market funds, unrealized loss | 0 |
Money market funds, fair value | $ 596 |

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