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Note 14 - Income Taxes - Reconciliation of Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statutory provision									$ 4,916	$ 5,515
Statutory provision, percentage									21.00%	21.00%	35.00%
Tax-exempt interest income									$ (853)	$ (1,046)
Tax-exempt interest income, percentage									(3.64%)	(3.98%)
Increase in cash surrender value and other income from life insurance, net									$ (91)	$ (170)
Increase in cash surrender value and other income from life insurance, net, percentage									(0.39%)	(0.65%)
ESOP Dividends									$ (113)	$ (98)
ESOP Dividends, percentage									(0.48%)	(0.37%)
State income tax, net of Federal benefit									$ 122	$ 125
State income tax, net of federal benefit, percentage									0.52%	0.48%
Other, net									$ (76)	$ (76)
Other, net, percentage									(0.32%)	(0.29%)
Effective income tax provision	$ 1,135	$ 1,096	$ 693	$ 981	$ 1,021	$ 1,111	$ 1,377	$ 741	$ 3,905	$ 4,250
Effective income tax provision, percentage									16.68%	16.18%

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Cash surrender value of life insurance in percentage.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the increase in cash surrender value of life insurance.

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