Note 5 - Loans - Impaired Loans, Segregated by Class of Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2021	Dec. 31, 2020
With no related allowance recorded, Unpaid Principal Balance	$ 2,697	$ 3,416
With no related allowance recorded, Recorded Investment	2,697	3,351
With no related allowance recorded, Average Recorded Investment	2,840	3,742
With no related allowance recorded, Interest Income Recognized	21	50
With a related allowance recorded, Unpaid Principal Balance	405	489
With a related allowance recorded, Recorded Investment	405	489
Related Allowance	180	100
With a related allowance recorded, Average Recorded Investment	421	495
With a related allowance recorded, Interest Income Recognized	5	6
Total by class of loans, Unpaid Principal Balance	3,102	3,905
Total by class of loans, Recorded Investment	3,102	3,840
Total by class of loans, Average Recorded Investment	3,261	4,237
Total by class of loans, Interest Income Recognized	26	56
Real Estate, Construction [Member]
With no related allowance recorded, Unpaid Principal Balance	136	304
With no related allowance recorded, Recorded Investment	136	239
With no related allowance recorded, Average Recorded Investment	135	246
With no related allowance recorded, Interest Income Recognized		11
With a related allowance recorded, Unpaid Principal Balance	193	211
With a related allowance recorded, Recorded Investment	193	211
Related Allowance	106	20
With a related allowance recorded, Average Recorded Investment	199	214
With a related allowance recorded, Interest Income Recognized
Total by class of loans, Unpaid Principal Balance	329	515
Total by class of loans, Recorded Investment	329	450
Total by class of loans, Average Recorded Investment	334	460
Total by class of loans, Interest Income Recognized		11
Real Estate, Mortgage [Member]
With no related allowance recorded, Unpaid Principal Balance	2,561	3,112
With no related allowance recorded, Recorded Investment	2,561	3,112
With no related allowance recorded, Average Recorded Investment	2,705	3,496
With no related allowance recorded, Interest Income Recognized	21	39
With a related allowance recorded, Unpaid Principal Balance	201	253
With a related allowance recorded, Recorded Investment	201	253
Related Allowance	70	76
With a related allowance recorded, Average Recorded Investment	204	250
With a related allowance recorded, Interest Income Recognized	5	6
Total by class of loans, Unpaid Principal Balance	2,762	3,365
Total by class of loans, Recorded Investment	2,762	3,365
Total by class of loans, Average Recorded Investment	2,909	3,746
Total by class of loans, Interest Income Recognized	26	45
Commercial And Industrial Loan [Member]
With a related allowance recorded, Unpaid Principal Balance	11	25
With a related allowance recorded, Recorded Investment	11	25
Related Allowance	4	4
With a related allowance recorded, Average Recorded Investment	18	31
With a related allowance recorded, Interest Income Recognized
Total by class of loans, Unpaid Principal Balance	11	25
Total by class of loans, Recorded Investment	11	25
Total by class of loans, Interest Income Recognized

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=123577603&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

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