Note 2 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Recorded Investment, with no related allowance	$ 450,000	$ 2,041,000
Unpaid Principal Balance, with no related allowance	449,000	2,588,000
Average Recorded Investment, with no related allowance	848,000	2,000,000
Interest Income Recognized, with no related allowance	6,000	116,000
Recorded Investment, with related allowance	1,939,000	3,011,000
Unpaid Principal Balance, with related allowance	1,933,000	3,000,000
Related Allowance	768,000	1,136,000
Average Recorded Investment, with related allowance	2,226,000	3,605,000
Interest Income Recognized, with related allowance	73,000	100,000
Recorded Investment	2,389,000	5,052,000
Unpaid Principal Balance	2,382,000	5,588,000
Average Recorded Investment	3,074,000	5,605,000
Interest Income Recognized	79,000	216,000
Real Estate Portfolio Segment [Member] \| Residential 1 to 4 Family [Member]
Recorded Investment, with no related allowance	139,000	1,090,000
Unpaid Principal Balance, with no related allowance	138,000	1,464,000
Average Recorded Investment, with no related allowance	377,000	1,090,000
Interest Income Recognized, with no related allowance	6,000	99,000
Recorded Investment, with related allowance	1,267,000	1,489,000
Unpaid Principal Balance, with related allowance	1,265,000	1,480,000
Related Allowance	612,000	795,000
Average Recorded Investment, with related allowance	1,335,000	1,590,000
Interest Income Recognized, with related allowance	49,000	83,000
Recorded Investment	1,406,000	2,579,000
Unpaid Principal Balance	1,403,000	2,944,000
Average Recorded Investment	1,712,000	2,680,000
Interest Income Recognized	55,000	182,000
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
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	951,000
Unpaid Principal Balance, with no related allowance	311,000	1,124,000
Average Recorded Investment, with no related allowance	471,000	910,000
Interest Income Recognized, with no related allowance	0	17,000
Recorded Investment, with related allowance	672,000	1,522,000
Unpaid Principal Balance, with related allowance	668,000	1,520,000
Related Allowance	156,000	341,000
Average Recorded Investment, with related allowance	891,000	2,015,000
Interest Income Recognized, with related allowance	24,000	17,000
Recorded Investment	983,000	2,473,000
Unpaid Principal Balance	979,000	2,644,000
Average Recorded Investment	1,362,000	2,925,000
Interest Income Recognized	24,000	34,000
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
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
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
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
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
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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