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Note 9 - Pensions and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Recognized actuarial (gain) loss | $ 27 | $ (413) | $ (677)
Settlement loss | 0 | (2,900) | (4,000)
Net loss (gain) | 3,749 | 9,096 | (4,105)
Recognized actuarial loss (gain) | 27 | (413) | (677)
Pension Plan [Member] |  |  |
Service cost | 2,204 | 2,408 | 2,727
Interest cost | 2,454 | 2,552 | 2,537
Expected return on plan assets | (3,561) | (4,481) | (4,697)
Recognized actuarial (gain) loss | 1,726 | 1,577 | 1,770
Settlement loss |  | 2,852 | 4,031
Net periodic benefit (credit) cost | 2,823 | 4,908 | 6,368
Total expense (benefit) recognized in net periodic benefit cost and other comprehensive income | 5,857 | 3,495 | 3,898
Service cost | 2,204 | 2,408 | 2,727
Interest cost | 2,454 | 2,552 | 2,537
Recognized actuarial loss (gain) | 1,726 | 1,577 | 1,770
Postretirement Plan [Member] |  |  |
Service cost | 1,083 | 775 | 1,249
Interest cost | 941 | 561 | 814
Net periodic benefit (credit) cost | 922 | (205) | 1,386
Net loss (gain) | 3,034 | (1,413) | (2,470)
Total expense (benefit) recognized in net periodic benefit cost and other comprehensive income | 4,671 | 8,891 | (2,719)
Service cost | 1,083 | 775 | 1,249
Interest cost | 941 | 561 | 814
Prior service cost recognition | $ (1,129) | $ (1,128) |

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- Definition Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -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 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + 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)(7) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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