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Note 3 - Investments - Available-For-Sale Marketable Securities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Debt Securities, Available-for-Sale, Amortized Cost, Current | $ 22,584 |
Debt Securities, Available-for-Sale, Unrealized Loss, Current | 38 |
Available-for-sale securities, current portion | 22,546 | $ 0
Debt Securities, Available-for-Sale, Amortized Cost, NoncurrentDebt Securities, Available-for-Sale, Amortized Cost, Noncurrent | 491 |
Available-for-sale securities, long-term | 489 | $ 0
Debt Securities, Available-for-Sale, Amortized Cost, Total | 23,075 |
Total marketable securities | 40 |
Debt Securities, Available-for-Sale, Total | 23,035 |
Due in one year or less | 22,584 |
Due in one year or less | 22,546 |
Due after one year through five years | 491 |
Due after one year through five years | 489 |
Total | 23,075 |
Marketable debt securities | 23,035 |
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 10,361 |
Debt Securities, Available-for-Sale, Unrealized Loss, Current | 26 |
Available-for-sale securities, current portion | 10,335 |
Due in one year or less | 10,361 |
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 11,524 |
Debt Securities, Available-for-Sale, Unrealized Loss, Current | 8 |
Available-for-sale securities, current portion | 11,516 |
Due in one year or less | 11,524 |
Other Debt Obligations [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 699 |
Debt Securities, Available-for-Sale, Unrealized Loss, Current | 4 |
Available-for-sale securities, current portion | 695 |
Debt Securities, Available-for-Sale, Amortized Cost, NoncurrentDebt Securities, Available-for-Sale, Amortized Cost, Noncurrent | 491 |
Debt Securities, Available-for-Sale, Unrealized Loss, Noncurrent | 2 |
Available-for-sale securities, long-term | 489 |
Due in one year or less | 699 |
Due after one year through five years | $ 491 |

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