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Note 12 - Pension and Other Postretirement Benefits - The Components of the Net Pension Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Retirement Plan [Member] |  |  |
Interest cost | $ 781 | $ 864 | $ 902
Amortization of unrecognized (gain) loss | 621 | 697 | 809
Expected return on plan assets | (1,452) | (1,392) | (1,394)
Net pension (benefit) expense | (50) | 169 | 317
Current year actuarial (gain) loss | (2,307) | (1,192) | 275
Amortization of actuarial gain (loss) | (621) | (697) | (809)
Total recognized in other comprehensive income | (2,928) | (1,889) | (534)
Total recognized in net pension cost (benefit) and other comprehensive loss | (2,978) | (1,720) | (217)
Amortization of actuarial gain (loss) | 621 | 697 | 809
Other Postretirement Benefits Plan [Member] |  |  |
Interest cost | 307 | 305 | 320
Amortization of unrecognized (gain) loss | 33 |  | 47
Net pension (benefit) expense | 605 | 536 | 641
Current year actuarial (gain) loss | (1,155) | 587 | (613)
Amortization of actuarial gain (loss) | (33) |  | (47)
Total recognized in other comprehensive income | (1,103) | 672 | (575)
Total recognized in net pension cost (benefit) and other comprehensive loss | (498) | 1,208 | 66
Service cost | 350 | 316 | 359
Amortization of past service credit | (85) | (85) | (85)
Amortization of prior service credit | 85 | 85 | 85
Amortization of actuarial gain (loss) | 33 |  | 47
Directors' Plan [Member] |  |  |
Interest cost | 78 | 89 | 97
Amortization of unrecognized (gain) loss | (91) | (92) | (86)
Net pension (benefit) expense | 41 | 79 | 93
Current year actuarial (gain) loss | (184) | (24) | (63)
Amortization of actuarial gain (loss) | (91) | (92) | (86)
Total recognized in other comprehensive income | (105) | 28 | (17)
Total recognized in net pension cost (benefit) and other comprehensive loss | (64) | 107 | 76
Service cost | 42 | 42 | 42
Amortization of past service credit | 12 | 40 | 40
Amortization of prior service credit | (12) | (40) | (40)
Amortization of actuarial gain (loss) | $ 91 | $ 92 | $ 86

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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=108410482&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=112275985&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=108410482&loc=d3e2709-114920 + 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=112275985&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=108410482&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=108410482&loc=d3e2709-114920 + Details
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