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Note 16 - Components of Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Balance | $ 183,726 | $ 190,238 | $ 184,896
Transfer from held to maturity to available for sale securities, net of tax |  |  | 891
Less amortization of prior service cost included in net periodic pension cost, net of tax | (87) | (87) | (86)
Balance | 200,607 | 183,726 | 190,238
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |
Balance | 76 | (5,072) | (3,704)
Unrealized holding gain (loss) on available for sale securities, net of tax | 13,176 | 5,595 | (2,246)
Transfer from held to maturity to available for sale securities, net of tax |  |  | 891
Reclassification adjustment, net of tax | (85) | (447) | (13)
Balance | 13,167 | 76 | (5,072)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |
Balance | (8,582) | (7,013) | (5,991)
Net pension gain (loss) arising during the period, net of tax | (1,478) | (1,482) | (936)
Less amortization of prior service cost included in net periodic pension cost, net of tax | (87) | (87) | (86)
Balance | (10,147) | (8,582) | (7,013)
AOCI Attributable to Parent [Member] |  |  |
Balance | (8,506) | (12,085) | (9,695)
Unrealized holding gain (loss) on available for sale securities, net of tax | 13,176 | 5,595 | (2,246)
Transfer from held to maturity to available for sale securities, net of tax |  |  | 891
Reclassification adjustment, net of tax | (85) | (447) | (13)
Net pension gain (loss) arising during the period, net of tax | (1,478) | (1,482) | (936)
Less amortization of prior service cost included in net periodic pension cost, net of tax | (87) | (87) | (86)
Balance | $ 3,020 | $ (8,506) | $ (12,085)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121640130&loc=d3e1436-108581 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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- Definition Amount, after tax and before adjustment, of unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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