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Note 3 - Investments - Available-For-Sale Marketable Securities (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Debt Securities, Available-for-Sale, Amortized Cost, Current | $ 34,658,000 |
Debt Securities, Available-for-Sale, Unrealized Loss, Current | 75,000 |
Available-for-sale securities, current portion | 34,583,000 | $ 0
Debt Securities, Available-for-Sale, Amortized Cost, NoncurrentDebt Securities, Available-for-Sale, Amortized Cost, Noncurrent | 490,000 |
Available-for-sale securities, long-term | 490,000 | 0
Debt Securities, Available-for-Sale, Amortized Cost, Total | 35,148,000 |
Total marketable securities | 75,000 |
Debt Securities, Available-for-Sale, Total | 35,073,000 |
Due in one year or less | 34,658,000 |
Due in one year or less | 34,583,000 | $ 0
Due after one year through five years | 490,000 |
Due after one year through five years | 490,000 |
Total | 35,148,000 |
Marketable debt securities | 35,073,000 |
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 13,102,000 |
Debt Securities, Available-for-Sale, Unrealized Loss, Current | 48,000 |
Available-for-sale securities, current portion | 13,054 |
Due in one year or less | 13,102,000 |
Due in one year or less | 13,054 |
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 20,112,000 |
Debt Securities, Available-for-Sale, Unrealized Loss, Current | 18,000 |
Available-for-sale securities, current portion | 20,094,000 |
Due in one year or less | 20,112,000 |
Due in one year or less | 20,094,000 |
Other Debt Obligations [Member] |  |
Debt Securities, Available-for-Sale, Amortized Cost, Current | 1,444,000 |
Debt Securities, Available-for-Sale, Unrealized Loss, Current | 9,000 |
Available-for-sale securities, current portion | 1,435,000 |
Debt Securities, Available-for-Sale, Amortized Cost, NoncurrentDebt Securities, Available-for-Sale, Amortized Cost, Noncurrent | 490,000 |
Debt Securities, Available-for-Sale, Unrealized Loss, Noncurrent | 0 |
Available-for-sale securities, long-term | 490,000 |
Due in one year or less | 1,444,000 |
Due in one year or less | 1,435,000 |
Due after one year through five years | $ 490,000 |

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