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Note 11 - Income Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current federal income tax expense | $ 3,070 | $ 984 | $ 946
Deferred federal income tax expense/(benefit) | 202 | 310 | 209
Income tax expense | 3,272 | 1,294 | 1,155
Income tax computed at statutory federal rate of 21% | 3,966 | 1,778 | 1,783
Tax exempt interest income | (574) | (320) | (309)
Tax exempt earnings on bank-owned life insurance | (162) | (162) | (81)
Tax credits | (240) | (218) | (154)
Nondeductible merger expenses | 182 | 164 | 0
Other items | $ 100 | $ 52 | $ (84)
Effective income tax rate | 17.00% | 15.00% | 14.00%

X
- 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 the acquisition of a business. + References No definition available. + 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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