Note 2 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Recorded Investment, with no related allowance	$ 1,412,000	$ 1,473,000
Unpaid Principal Balance, with no related allowance	1,738,000	1,818,000
Average Recorded Investment, with no related allowance	1,443,000	706,000
Interest Income Recognized, with no related allowance	2,000	26,000
Recorded Investment, with related allowance	1,871,000	1,904,000
Unpaid Principal Balance, with related allowance	1,865,000	1,899,000
Related Allowance	699,000	742,000
Average Recorded Investment, with related allowance	1,888,000	1,949,000
Interest Income Recognized, with related allowance	23,000	88,000
Recorded Investment	3,283,000	3,377,000
Unpaid Principal Balance	3,603,000	3,717,000
Average Recorded Investment	3,331,000	2,655,000
Interest Income Recognized	25,000	114,000
Real Estate Portfolio Segment [Member] \| Residential 1 to 4 Family [Member]
Recorded Investment, with no related allowance	1,101,000	1,162,000
Unpaid Principal Balance, with no related allowance	1,427,000	1,507,000
Average Recorded Investment, with no related allowance	1,132,000	395,000
Interest Income Recognized, with no related allowance	2,000	26,000
Recorded Investment, with related allowance	1,217,000	1,242,000
Unpaid Principal Balance, with related allowance	1,214,000	1,240,000
Related Allowance	558,000	594,000
Average Recorded Investment, with related allowance	1,230,000	1,273,000
Interest Income Recognized, with related allowance	15,000	66,000
Recorded Investment	2,318,000	2,404,000
Unpaid Principal Balance	2,641,000	2,747,000
Average Recorded Investment	2,362,000	1,668,000
Interest Income Recognized	17,000	92,000
Real Estate Portfolio Segment [Member] \| Multifamily Real Estate [Member]
Recorded Investment, with no related allowance	0	0
Unpaid Principal Balance, with no related allowance	0	0
Average Recorded Investment, with no related allowance	0	0
Interest Income Recognized, with no related allowance	0	0
Recorded Investment, with related allowance	0	0
Unpaid Principal Balance, with related allowance	0	0
Related Allowance	0	0
Average Recorded Investment, with related allowance	0	0
Interest Income Recognized, with related allowance	0	0
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Real Estate Portfolio Segment [Member] \| Commercial Real Estate [Member]
Recorded Investment, with no related allowance	311,000	311,000
Unpaid Principal Balance, with no related allowance	311,000	311,000
Average Recorded Investment, with no related allowance	311,000	311,000
Interest Income Recognized, with no related allowance	0	0
Recorded Investment, with related allowance	654,000	662,000
Unpaid Principal Balance, with related allowance	651,000	659,000
Related Allowance	141,000	148,000
Average Recorded Investment, with related allowance	658,000	676,000
Interest Income Recognized, with related allowance	8,000	22,000
Recorded Investment	965,000	973,000
Unpaid Principal Balance	962,000	970,000
Average Recorded Investment	969,000	987,000
Interest Income Recognized	8,000	22,000
Real Estate Portfolio Segment [Member] \| Construction Loans [Member]
Recorded Investment, with no related allowance	0	0
Unpaid Principal Balance, with no related allowance	0	0
Average Recorded Investment, with no related allowance	0	0
Interest Income Recognized, with no related allowance	0	0
Recorded Investment, with related allowance	0	0
Unpaid Principal Balance, with related allowance	0	0
Related Allowance	0	0
Average Recorded Investment, with related allowance	0	0
Interest Income Recognized, with related allowance	0	0
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Real Estate Portfolio Segment [Member] \| Farmland [Member]
Recorded Investment, with no related allowance	0	0
Unpaid Principal Balance, with no related allowance	0	0
Average Recorded Investment, with no related allowance	0
Interest Income Recognized, with no related allowance	0	0
Recorded Investment, with related allowance	0	0
Unpaid Principal Balance, with related allowance	0	0
Related Allowance	0	0
Average Recorded Investment, with related allowance	0	0
Interest Income Recognized, with related allowance	0	0
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Real Estate Portfolio Segment [Member] \| Second Mortgages [Member]
Recorded Investment, with no related allowance	0	0
Unpaid Principal Balance, with no related allowance	0	0
Average Recorded Investment, with no related allowance	0	0
Interest Income Recognized, with no related allowance	0	0
Recorded Investment, with related allowance	0	0
Unpaid Principal Balance, with related allowance	0	0
Related Allowance	0	0
Average Recorded Investment, with related allowance	0	0
Interest Income Recognized, with related allowance	0	0
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Real Estate Portfolio Segment [Member] \| Home Equity Line of Credit [Member]
Recorded Investment, with no related allowance	0	0
Unpaid Principal Balance, with no related allowance	0	0
Average Recorded Investment, with no related allowance	0	0
Interest Income Recognized, with no related allowance	0	0
Recorded Investment, with related allowance	0	0
Unpaid Principal Balance, with related allowance	0	0
Related Allowance	0	0
Average Recorded Investment, with related allowance	0	0
Interest Income Recognized, with related allowance	0	0
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Commercial Portfolio Segment [Member]
Recorded Investment, with no related allowance	0	0
Unpaid Principal Balance, with no related allowance	0	0
Average Recorded Investment, with no related allowance	0	0
Interest Income Recognized, with no related allowance	0	0
Recorded Investment, with related allowance	0	0
Unpaid Principal Balance, with related allowance	0	0
Related Allowance	0	0
Average Recorded Investment, with related allowance	0	0
Interest Income Recognized, with related allowance	0	0
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Agricultural Installment and Other Portfolio Segment [Member]
Recorded Investment, with no related allowance	0	0
Unpaid Principal Balance, with no related allowance	0	0
Average Recorded Investment, with no related allowance	0	0
Interest Income Recognized, with no related allowance	0	0
Recorded Investment, with related allowance	0	0
Unpaid Principal Balance, with related allowance	0	0
Related Allowance	0	0
Average Recorded Investment, with related allowance	0	0
Interest Income Recognized, with related allowance	0	0
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	$ 0	$ 0

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524

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