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Note 15 - Income Taxes - Reconciliation of Statutory Federal Tax Rate and Effective Tax Rate From Continuing Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Federal income tax at the statutory rate, amount |  |  |  |  |  |  |  |  | $ 9,683 | $ 10,457 | $ 9,475
Federal income tax at the statutory rate |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
State income tax, net of federal benefit, amount |  |  |  |  |  |  |  |  | $ 1,109 | $ 1,220 | $ 1,016
State income tax, net of federal benefit |  |  |  |  |  |  |  |  | 3.12% | 3.12% | 2.25%
Total effective income tax rate reconciliation, amount |  |  |  |  |  |  |  |  | $ 10,792 | $ 11,677 | $ 10,491
Total effective income tax rate reconciliation |  |  |  |  |  |  |  |  | 24.12% | 24.12% | 23.25%
Tax-exempt interest income, amount |  |  |  |  |  |  |  |  | $ (500) | $ (637) | $ (702)
Tax-exempt interest income |  |  |  |  |  |  |  |  | (1.51%) | (1.28%) | (1.56%)
Nondeductible goodwill impairment and disposition, amount |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 569
Nondeductible goodwill impairment and disposition |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 1.26%
Bank owned life insurance, amount |  |  |  |  |  |  |  |  | $ (139) | $ (249) | $ (144)
Bank owned life insurance |  |  |  |  |  |  |  |  | (0.42%) | (0.50%) | (0.32%)
Deferred tax revaluation, amount |  |  |  |  |  |  |  |  | $ 0 | $ (98) | $ (1,669)
Deferred tax revaluation |  |  |  |  |  |  |  |  | 0.00% | (0.20%) | (3.70%)
Other items, net, amount |  |  |  |  |  |  |  |  | $ 33 | $ 301 | $ 237
Other items, net |  |  |  |  |  |  |  |  | (0.10%) | 0.10% | 0.53%
Total income tax expense | $ 3,389 | $ 2,332 | $ 2,270 | $ 2,195 | $ 2,833 | $ 2,580 | $ 2,951 | $ 2,630 | $ 10,186 | $ 10,994 | $ 8,782
Income tax at the effective tax rate |  |  |  |  |  |  |  |  | 22.09% | 22.24% | 19.46%

X
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to domestic, state, and local income taxes. + References No definition available. + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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