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v3.23.1

Note 4 - Investments (Tables) | 3 Months Ended
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Mar. 31, 2023
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | March 31, 2023 |
(In thousands) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Short-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 9,496 |  |  | $ | - |  |  | $ | 259 |  |  | $ | 9,237 |
Certificates of deposit |  |  | 10,995 |  |  |  | - |  |  |  | 248 |  |  |  | 10,747 |
Investment securities – short-term |  | $ | 20,491 |  |  | $ | - |  |  | $ | 507 |  |  | $ | 19,984 |
Long-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S Treasury securities |  | $ | 6,702 |  |  | $ | - |  |  | $ | 539 |  |  | $ | 6,163 |
Certificates of deposit |  |  | 2,469 |  |  |  | 1 |  |  |  | 105 |  |  |  | 2,364 |
Investment securities – long-term |  | $ | 9,171 |  |  | $ | 1 |  |  | $ | 644 |  |  | $ | 8,527 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  | In Unrealized Loss Position For Less Than 12 Months |  |  | In Unrealized Loss Position For Greater Than 12 Months |
(In thousands) |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
U.S Treasury securities |  | $ | - |  |  | $ | - |  |  | $ | 15,433 |  |  | $ | 798 |
Certificates of deposit |  |  | 2,017 |  |  |  | 43 |  |  |  | 10,849 |  |  |  | 310 |
Investment securities |  | $ | 2,017 |  |  | $ | 43 |  |  | $ | 26,282 |  |  | $ | 1,108 |

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