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Note 4 - Investments - Available-For-Sale Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-Sale, Amortized Cost, Current | $ 43,313 |
Debt Securities, Available-for-Sale, Unrealized Gain, Current | 7 |
Debt Securities, Available-for-Sale, Unrealized Loss, Current | 60 |
Available-for-sale securities, current portion | 43,260 | $ 0
Debt Securities, Available-for-Sale, Amortized Cost, NoncurrentDebt Securities, Available-for-Sale, Amortized Cost, Noncurrent | 1,329 |
Available-for-sale securities, long term | 1,332 | 0
Debt Securities, Available-for-Sale, Amortized Cost, Total | 44,642 |
Debt Securities, Available-for-Sale, Unrealized Gain | 10 |
Debt Securities, Available-for-Sale, Unrealized Loss | 60 |
Debt Securities, Available-for-Sale, Total | 44,592 |
Due in one year or less | 43,313 |
Due in one year or less | 43,260 | $ 0
Due after one year through five years | 1,329 |
Due after one year through five years | 1,332 |
Total | 44,642 |
Marketable debt securities | 44,592 |
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 15,087 |
Debt Securities, Available-for-Sale, Unrealized Gain, Current | 1 |
Debt Securities, Available-for-Sale, Unrealized Loss, Current | 37 |
Available-for-sale securities, current portion | 15,051 |
Due in one year or less | 15,087 |
Due in one year or less | 15,051 |
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 26,057 |
Debt Securities, Available-for-Sale, Unrealized Gain, Current | 6 |
Debt Securities, Available-for-Sale, Unrealized Loss, Current | 16 |
Available-for-sale securities, current portion | 26,047 |
Due in one year or less | 26,057 |
Due in one year or less | 26,047 |
Other Debt Obligations [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 2,169 |
Debt Securities, Available-for-Sale, Unrealized Gain, Current | 0 |
Debt Securities, Available-for-Sale, Unrealized Loss, Current | 7 |
Available-for-sale securities, current portion | 2,162 |
Debt Securities, Available-for-Sale, Amortized Cost, NoncurrentDebt Securities, Available-for-Sale, Amortized Cost, Noncurrent | 1,329 |
Debt Securities, Available-for-Sale, Unrealized Gain, Noncurrent | 3 |
Debt Securities, Available-for-Sale, Unrealized Loss, Noncurrent | 0 |
Available-for-sale securities, long term | 1,332 |
Due in one year or less | 2,169 |
Due in one year or less | 2,162 |
Due after one year through five years | $ 1,329 |

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