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v3.23.1

Note 4 - Investments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2023
Notes Tables |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | March 31, 2023 |
|  | Amortized |  |  | Gross unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Available-for-sale securities, current portion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 9,386 |  |  | $ | - |  |  | $ | 9 |  |  | $ | 9,377 |
Corporate debt securities |  |  | 24,663 |  |  |  | 7 |  |  |  | 7 |  |  |  | 24,663 |
Other debt securities |  |  | 1,743 |  |  |  | - |  |  |  | 3 |  |  |  | 1,740 |
Total short-term |  |  | 35,792 |  |  |  | 7 |  |  |  | 19 |  |  |  | 35,780 |
Available-for-sale securities, long-term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other debt securities |  |  | 2,018 |  |  |  | 2 |  |  |  | 1 |  |  |  | 2,019 |
Total marketable securities |  | $ | 37,810 |  |  | $ | 9 |  |  | $ | 20 |  |  | $ | 37,799 |
|  | Amortized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 35,792 |  |  | $ | 35,780 |
Due after one year through five years |  |  | 2,018 |  |  |  | 2,019 |
Total |  | $ | 37,810 |  |  | $ | 37,799 |

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