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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Average recorded investment	$ 18,721	$ 14,914	$ 15,850	$ 14,968
Interest income recognized	172	129	535	368
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]
Average recorded investment	2,893	3,548	3,173	3,891
Interest income recognized	0	35	55	107
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]
Average recorded investment	12,912	7,796	9,988	6,426
Interest income recognized	129	60	387	179
Residential Portfolio Segment [Member]
Average recorded investment	1,242	1,632	1,229	1,713
Interest income recognized	14	14	39	37
Commercial And Industrial [Member]
Average recorded investment	1,376	1,786	1,136	1,992
Interest income recognized	28	20	49	44
Home Equity Lines of Credit [Member]
Average recorded investment	298	150	323	134
Interest income recognized	1	0	5	1
Consumer Portfolio Segment [Member]
Average recorded investment	0	2	1	2
Interest income recognized	$ 0	0	$ 0	0
Construction and Other [Member]
Average recorded investment		0		810
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=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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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=121611835&loc=d3e5212-111524

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