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Note 2 - Investments in Bond Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Debt Securities, Held-to-Maturity [Table Text Block] |
|  | 2023 |  |  | 2022 |
|  | (in thousands) |
Amortized cost |  | $ | 3,135 |  |  | $ | 2,983 |
Unrealized gains |  |  | 4 |  |  |  | 9 |
Fair value |  | $ | 3,139 |  |  | $ | 2,992 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | 2023 |  |  | 2022 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
|  | (in thousands) |
One year or less |  | $ | 2,671 |  |  | $ | 2,671 |  |  | $ | 2,432 |  |  | $ | 2,440 |
Greater than one year through five years |  |  | 464 |  |  |  | 468 |  |  |  | 551 |  |  |  | 552 |
|  | $ | 3,135 |  |  | $ | 3,139 |  |  | $ | 2,983 |  |  | $ | 2,992 |

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