Note 12 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	34.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			$ 290,000
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate
Unrecognized Tax Benefits, Ending Balance	$ 0	$ 0
Retained Earnings, Appropriated	909,000	909,000
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Bad Debt Reserve for Tax Purposes of Qualified Lender	$ 191,000	$ 191,000
Open Tax Year	2016 2017 2018 2019
Retained Earnings [Member]
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate			352,000
Retained Earnings [Member] \| Accounting Standards Update 2018-02 [Member]
Reclassification from AOCI to Retained Earnings for Change in Federal Tax Rate			$ 352,000

The reclassification from AOCI to retained earnings resulted from the change in federal tax rate.

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Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to bad debt reserve for tax purposes of a qualified lender.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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