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Note 8 - Loans and Related Allowance for Loan and Lease Losses - Additional Information on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Average recorded investment	$ 8,976	$ 18,721	$ 8,725	$ 15,850
Interest income recognized	81	172	219	535
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]
Average recorded investment	1,428	2,893	1,485	3,173
Interest income recognized	14	0	45	55
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]
Average recorded investment	5,419	12,912	4,955	9,988
Interest income recognized	34	129	101	387
Residential Portfolio Segment [Member]
Average recorded investment	1,190	1,242	1,234	1,229
Interest income recognized	18	14	42	39
Commercial And Industrial [Member]
Average recorded investment	694	1,376	807	1,136
Interest income recognized	9	28	22	49
Home Equity Lines of Credit [Member]
Average recorded investment	245	298	244	323
Interest income recognized	$ 6	1	$ 9	5
Consumer Portfolio Segment [Member]
Average recorded investment		0		1
Interest income recognized		$ 0		$ 0

X

- Definition

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

+ References

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
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

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X

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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)(2)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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