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Note 9 - Accrued Retirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | March 31, 2022 (unaudited) |  |  | December 31, 2021 (audited) |
|  | (in thousands) |
Defined benefit pension plan |  | $ | 5,875 |  |  | $ | 5,932 |
Non-qualified retirement plans |  |  | 2,129 |  |  |  | 2,147 |
Total |  |  | 8,004 |  |  |  | 8,079 |
Less current portion |  |  | 142 |  |  |  | 142 |
Non-current portion of accrued retirement benefits |  | $ | 7,862 |  |  | $ | 7,937 |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Three Months Ended March 31, (unaudited) |
|  | 2022 |  |  | 2021 |
|  | (in thousands) |
Interest cost |  | $ | 264 |  |  | $ | 309 |
Expected return on plan assets |  |  | (306 | ) |  |  | (414 | )
Amortization of net actuarial loss |  |  | 156 |  |  |  | 221 |
Pension and other postretirement expenses |  | $ | 114 |  |  | $ | 116 |

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