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Note 6 - Accrued Retirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | 2022 |  |  | 2021 |
|  | (in thousands) |
Defined benefit pension plan |  | $ | 1,023 |  |  | $ | 5,932 |
Non-qualified retirement plan |  |  | 1,731 |  |  |  | 2,147 |
Total |  |  | 2,754 |  |  |  | 8,079 |
Less current portion |  |  | (142 | ) |  |  | (142 | )
Non-current portion of accrued retirement benefits |  | $ | 2,612 |  |  | $ | 7,937 |
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] |
|  | 2022 |  |  | 2021 |
|  | (in thousands) |
Change in benefit obligations: |  |  |  |  |  |  |  |
Benefit obligations at beginning of year |  | $ | 40,182 |  |  | $ | 54,655 |
Interest cost |  |  | 1,034 |  |  |  | 1,237 |
Actuarial gain |  |  | (7,772 | ) |  |  | (1,160 | )
Benefits paid |  |  | (16,907 | ) |  |  | (14,550 | )
Benefit obligations at end of year |  |  | 16,537 |  |  |  | 40,182 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  |  | 32,103 |  |  |  | 43,587 |
Actual return on plan assets |  |  | (7,241 | ) |  |  | 1,384 |
Employer contributions |  |  | 5,828 |  |  |  | 1,682 |
Benefits paid |  |  | (16,907 | ) |  |  | (14,550 | )
Fair value of plan assets at end of year |  |  | 13,783 |  |  |  | 32,103 |
Funded status |  | $ | (2,754 | ) |  | $ | (8,079 | )
Accumulated benefit obligations |  | $ | 16,537 |  |  | $ | 40,182 |
Defined Benefit Plan, Assumptions [Table Text Block] |
Weighted average assumptions to determine benefit obligations: |
Discount rate |  |  | 5.11 | - | 5.14% |  |  |  | 2.69 | - | 2.74% |
Expected long-term return on plan assets |  |  |  | 5.00% |  |  |  |  |  | 4.00% |  |
Rate of compensation increase |  |  |  | n/a |  |  |  |  |  | n/a |  |
Weighted average assumptions used to determine net periodic benefit cost: |  | 2022 |  |  | 2021 |
Discount rate |  |  | 2.69 | - | 2.74% |  |  |  | 2.28 | - | 2.35% |
Expected long-term return on plan assets |  |  |  | 4.00% |  |  |  |  |  | 4.50% |  |
Rate of compensation increase |  |  |  | n/a |  |  |  |  |  | n/a |  |
Schedule of Net Benefit Costs [Table Text Block] |
|  | 2022 |  |  | 2021 |
|  | (in thousands) |
Pension and other benefits: |  |  |  |  |  |  |  |
Interest cost |  | $ | 1,034 |  |  | $ | 1,237 |
Expected return on plan assets |  |  | (1,226 | ) |  |  | (1,680 | )
Recognized net actuarial loss |  |  | 585 |  |  |  | 933 |
Settlement expense |  |  | 7,492 |  |  |  | 4,252 |
Pension expense |  | $ | 7,885 |  |  | $ | 4,742 |
Other changes in plan assets and benefit obligations recognized in comprehensive income: |  |  |  |  |  |  |  |
Net loss (gain) |  | $ | 696 |  |  | $ | (865 | )
Amortization of recognized loss |  |  | (8,077 | ) |  |  | (5,185 | )
Total recognized gain in comprehensive income |  | $ | (7,381 | ) |  | $ | (6,050 | )
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | 2022 Fair Value Measurements (in thousands) |  |  |  |  |  |  |  |  |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Measured at NAV as a practical expedient |  |  | Total |
ACIT equity funds |  | $ | - |  |  | $ | 631 |  |  | $ | 828 |  |  | $ | 1,459 |
ACIT fixed income funds |  |  | - |  |  |  | 10,666 |  |  |  | 261 |  |  |  | 10,927 |
Cash management funds |  |  | - |  |  |  | 1,397 |  |  |  | - |  |  |  | 1,397 |
|  | $ | - |  |  | $ | 12,694 |  |  | $ | 1,089 |  |  | $ | 13,783 |
|  | 2021 Fair Value Measurements (in thousands) |  |  |  |  |  |  |  |  |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Measured at NAV as a practical expedient |  |  | Total |
ACIT equity funds |  | $ | - |  |  | $ | 6,385 |  |  | $ | 1,425 |  |  | $ | 7,810 |
ACIT fixed income funds |  |  | - |  |  |  | 21,114 |  |  |  | 1,746 |  |  |  | 22,860 |
Cash management funds |  |  | - |  |  |  | 1,433 |  |  |  | - |  |  |  | 1,433 |
|  | $ | - |  |  | $ | 28,932 |  |  | $ | 3,171 |  |  | $ | 32,103 |
Schedule of Expected Benefit Payments [Table Text Block] |
Years ending December 31, |
2023 |  | $ | 1,507 |
2024 |  | $ | 1,474 |
2025 |  | $ | 1,448 |
2026 |  | $ | 1,416 |
2027 |  | $ | 1,379 |
2028-2032 |  | $ | 6,283 |

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