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Note 16 - Benefit Plans (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employer Contribution under Medical and Dental Plan |  |  | $ 18,290 | $ 14,660 | $ 14,992
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement, Total | [1] |  | 10,920 | (0) | (0)
Payment for Pension Benefits |  |  | 1,017 | 9,400 |
Defined Benefit Plan, Amortization of Gain (Loss) |  |  | (843) | (802) | (883)
Defined Benefit Plan, Plan Assets, Amount, Ending Balance |  | $ 0 | $ 0 | $ 61,870 | 58,014
Equity and Real Estate [Member] | Minimum [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 75.00% | 75.00% |  |
Equity and Real Estate [Member] | Maximum [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  | 85.00% | 85.00% |  |
Savings Plan 401(k) [Member] |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  |  |  | 50.00% |
Defined Contribution Plan Percentage of Eligible Compensation |  |  |  | 6.00% |
Defined Contribution Plan, Cost |  |  | $ 4,791 | $ 4,193 | $ 3,600
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement, Total |  | $ 10,920 |  |  |
Defined Benefit Plan, Amortization of Gain (Loss) |  |  | (843) |  |
Defined Benefit Plan, Plan Assets, Amount, Ending Balance |  | $ 0 | $ 0 | $ 61,870 |
[1] | Represents pre-tax settlement charges related to the termination of the Company’s domestic pension plan in the fourth quarter of 2019.

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- Definition Contribution made under medical and dental plan made by the employer. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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