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Note 8 - Components of Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Loss) (Details) (Parentheticals) - USD ($) | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | $ 1,028,000 | $ 1,209
Reclassification adjustment for gain included in net income, taxes | (4,000) | (3,000)
Reclassification adjustment for gain included in net income, taxes | (4,000) | (3,000)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | 0 |
Reclassification adjustment for gain included in net income, taxes | 0 | 0
Reclassification adjustment for gain included in net income, taxes | 0 | 0
AOCI Attributable to Parent [Member] |  |
Unrealized holding gain (loss) on available for sale securities, tax | 1,028,000 | 1,209
Reclassification adjustment for gain included in net income, taxes | (4,000) | (3,000)
Reclassification adjustment for gain included in net income, taxes | $ (4,000) | $ (3,000)

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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL34724391-108580 + Details
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