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Note 6 - Accrued Retirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | 2017 |  |  | 2016 |
|  | (in thousands) |
Defined benefit pension plans |  | $ | 5,812 |  |  | $ | 7,560 |
Non-qualified retirement plans |  |  | 2,219 |  |  |  | 1,674 |
Total |  |  | 8,031 |  |  |  | 9,234 |
Less current portion |  |  | (164 | ) |  |  | (175 | )
Non-current portion of accrued retirement benefits |  | $ | 7,867 |  |  | $ | 9,059 |
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] |
|  | 2017 |  |  |  | 2016 |
|  | (in thousands) |
Change in benefit obligations: |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligations at beginning of year |  | $ | 56,378 |  |  |  | $ | 66,852 |
Interest cost |  |  | 2,216 |  |  |  |  | 2,804 |
Actuarial loss (gain) |  |  | 2,074 |  |  |  |  | 1,042 |
Benefits paid |  |  | (4,216 | ) |  |  |  | (4,217 | )
Lump sum payments |  |  | - |  |  |  |  | (10,103 | )
Benefit obligations at end of year |  |  | 56,452 |  |  |  |  | 56,378 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  |  | 47,176 |  |  |  |  | 56,434 |
Actual return on plan assets |  |  | 5,531 |  |  |  |  | 5,188 |
Employer reimbursement for retirement benefits |  |  | (230 | ) |  |  |  | (1,054 | )
Employer contributions |  |  | 181 |  |  |  |  | 928 |
Benefits paid |  |  | (4,216 | ) |  |  |  | (4,217 | )
Lump sum payments |  |  | - |  |  |  |  | (10,103 | )
Fair value of plan assets at end of year |  |  | 48,442 |  |  |  |  | 47,176 |
Funded status |  | $ | (8,010 | ) |  |  | $ | (9,202 | )
Accumulated benefit obligations |  | $ | 56,452 |  |  |  | $ | 56,378 |
Weighted average assumptions used to determine benefit obligations at December 31: |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 3.59% | - | 3.64% |  |  |  | 4.07% | - | 4.14% |
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] |
|  | 2017 |  |  | 2016 |
|  | (in thousands) |
Pension and other benefits: |  |  |  |  |  |  |  |
Interest cost |  | $ | 2,216 |  |  | $ | 2,804 |
Expected return on plan assets |  |  | (2,255 | ) |  |  | (2,713 | )
Recognized net actuarial loss |  |  | 840 |  |  |  | 1,030 |
Settlement/Curtailment Expense |  |  | - |  |  |  | 3,958 |
Pension expense |  | $ | 801 |  |  | $ | 5,079 |
Other changes in plan assets and benefit obligations recognized in comprehensive income: |  |  |  |  |  |  |  |
Net gain |  | $ | (1,201 | ) |  | $ | (1,384 | )
Recognized gain |  |  | (840 | ) |  |  | (4,988 | )
Total recognized gain in comprehensive income |  | $ | (2,041 | ) |  | $ | (6,372 | )
Schedule of Assumptions Used [Table Text Block] |
Weighted average assumptions used to determine net periodic benefit cost: |  | 2017 |  |  | 2016 |
Pension benefits: |  |  |  |  |  |  |  |  |  |
Discount rate |  | 4.07% | - | 4.14% |  |  | 4.30% | - | 4.44% |
Expected long-term return on plan assets |  | 5.00% |  |  | 5.00% |
Rate of compensation increase |  | n/a |  |  | n/a |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | 2017 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 |  | $ | - |  |  | $ | 14,772 |  |  | $ | 14,772 |
AHGT pooled fixed income funds |  |  | - |  |  |  | 32,581 |  |  |  | 32,581 |
Cash management funds |  |  | - |  |  |  | 1,089 |  |  |  | 1,089 |
|  | $ | - |  |  | $ | 48,442 |  |  | $ | 48,442 |
|  | 2016 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 |  | $ | - |  |  | $ | 7,177 |  |  | $ | 7,177 |
AHGT pooled fixed income funds |  |  | - |  |  |  | 39,025 |  |  |  | 39,025 |
Cash management funds |  |  | - |  |  |  | 974 |  |  |  | 974 |
|  | $ | - |  |  | $ | 47,176 |  |  | $ | 47,176 |
Schedule of Expected Benefit Payments [Table Text Block] |
2018 |  |  | $ | 4,225 |
2019 |  |  |  | 4,154 |
2020 |  |  |  | 4,077 |
2021 |  |  |  | 3,981 |
2022 |  |  |  | 3,865 |
2023 - 2027 |  |  |  | 17,680 |

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- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(b)(c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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