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Note 8 - Accrued Retirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2024
Notes Tables |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | September 30, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
|  | (unaudited) |  |  | (audited) |
|  | (in thousands) |
Defined benefit pension plan |  | $ | (63 | ) |  | $ | (33 | )
Non-qualified retirement plans |  |  | 1,690 |  |  |  | 1,725 |
Total |  |  | 1,627 |  |  |  | 1,692 |
Less current portion |  |  | (142 | ) |  |  | (142 | )
Non-current portion of accrued retirement benefits |  | $ | 1,485 |  |  | $ | 1,550 |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Three Months Ended September 30, (unaudited) |  |  | Nine Months Ended September 30, (unaudited) |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
|  | (in thousands) |  |  | (in thousands) |
Interest cost |  | $ | 184 |  |  | $ | 203 |  |  | $ | 552 |  |  | $ | 608 |
Expected return on plan assets |  |  | (174 | ) |  |  | (165 | ) |  |  | (522 | ) |  |  | (491 | )
Amortization of net loss |  |  | 68 |  |  |  | 83 |  |  |  | 204 |  |  |  | 247 |
Pension and other postretirement expenses |  | $ | 78 |  |  | $ | 121 |  |  | $ | 234 |  |  | $ | 364 |

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