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Note 6 - Accrued Retirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | 2019 |  |  | 2018 |
|  | (in thousands) |
Defined benefit pension plans |  | $ | 7,658 |  |  | $ | 7,971 |
Non-qualified retirement plans |  |  | 2,209 |  |  |  | 2,065 |
Total |  |  | 9,867 |  |  |  | 10,036 |
Less current portion |  |  | (165 | ) |  |  | (165 | )
Non-current portion of accrued retirement benefits |  | $ | 9,702 |  |  | $ | 9,871 |
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] |
|  | 2019 |  |  | 2018 |
|  | (in thousands) |
Change in benefit obligations: |  |  |  |  |  |  |  |
Benefit obligations at beginning of year |  | $ | 51,306 |  |  | $ | 56,453 |
Interest cost |  |  | 2,096 |  |  |  | 1,974 |
Actuarial loss (gain) |  |  | 4,706 |  |  |  | (3,096 | )
Benefits paid |  |  | (3,980 | ) |  |  | (4,025 | )
Benefit obligations at end of year |  |  | 54,128 |  |  |  | 51,306 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  |  | 41,290 |  |  |  | 48,442 |
Actual return on plan assets |  |  | 6,814 |  |  |  | (3,114 | )
Employer reimbursement for retirement benefits |  |  | - |  |  |  | (118 | )
Employer contributions |  |  | 160 |  |  |  | 105 |
Benefits paid |  |  | (3,980 | ) |  |  | (4,025 | )
Fair value of plan assets at end of year |  |  | 44,284 |  |  |  | 41,290 |
Funded status |  | $ | (9,844 | ) |  | $ | (10,016 | )
Accumulated benefit obligations |  | $ | 54,128 |  |  | $ | 51,306 |
Defined Benefit Plan, Assumptions [Table Text Block] |
Weighted average assumptions used to determine benefit obligations at December 31st: |  |  |  |  |  |  |  |  |  |
Discount rate |  | 3.10% | - | 3.14% |  |  |  | 4.28% |  |
Expected long-term return on plan assets |  |  | 5.00% |  |  |  |  | 5.00% |  |
Rate of compensation increase |  |  | n/a |  |  |  |  | n/a |  |
Weighed average assumptions used to determine net periodic benefit cost: |  | 2019 |  |  | 2018 |
Discount rate |  |  | 4.28% |  |  | 3.59% | - | 3.64% |
Expected long-term return on plan assets |  |  | 5.00% |  |  |  | 5.00% |  |
Rate of compensation increase |  |  | n/a |  |  |  | n/a |  |
Schedule of Net Benefit Costs [Table Text Block] |
|  | 2019 |  |  | 2018 |
|  | (in thousands) |
Pension and other benefits: |  |  |  |  |  |  |  |
Interest cost |  | $ | 2,096 |  |  | $ | 1,974 |
Expected return on plan assets |  |  | (1,965 | ) |  |  | (2,319 | )
Recognized net actuarial loss |  |  | 865 |  |  |  | 786 |
Pension expense |  | $ | 996 |  |  | $ | 441 |
Other changes in plan assets and benefit obligations recognized in comprehensive income: |  |  |  |  |  |  |  |
Net (gain) loss |  | $ | (141 | ) |  | $ | 2,314 |
Recognized gain |  |  | (865 | ) |  |  | (764 | )
Total recognized (gain) loss in comprehensive income |  | $ | (1,006 | ) |  | $ | 1,550 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | 2019 Fair Value Measurements (in thousands) |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Total |
AHGT pooled equity funds |  | $ | - |  |  | $ | 12,714 |  |  | $ | 12,714 |
AHGT pooled fixed income funds |  |  | - |  |  |  | 30,548 |  |  |  | 30,548 |
Cash management funds |  |  | - |  |  |  | 1,022 |  |  |  | 1,022 |
|  | $ | - |  |  | $ | 44,284 |  |  | $ | 44,284 |
|  | 2018 Fair Value Measurements (in thousands) |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Total |
AHGT pooled equity funds |  | $ | - |  |  | $ | 10,665 |  |  | $ | 10,665 |
AHGT pooled fixed income funds |  |  | - |  |  |  | 29,635 |  |  |  | 29,635 |
Cash management funds |  |  | - |  |  |  | 990 |  |  |  | 990 |
|  | $ | - |  |  | $ | 41,290 |  |  | $ | 41,290 |
Schedule of Expected Benefit Payments [Table Text Block] |
2020 |  |  |  | $ | 4,080 |
2021 |  |  |  | $ | 3,985 |
2022 |  |  |  | $ | 3,870 |
2023 |  |  |  | $ | 3,754 |
2024 |  |  |  | $ | 3,652 |
2025 | - | 2029 |  | $ | 16,605 |

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