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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Average recorded investment	$ 14,914	$ 11,693	$ 14,968	$ 13,429
Interest income recognized	129	100	368	300
Commercial And Industrial [Member]
Average recorded investment	1,786	2,984	1,992	4,620
Interest income recognized	20	32	44	100
Real Estate Construction Porfolio Segment [Member]
Average recorded investment			810	11
Interest income recognized
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Average recorded investment	1,782	2,574	1,847	2,672
Interest income recognized	14	18	38	49
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Average recorded investment	11,344	6,132	10,317	6,123
Interest income recognized	95	50	286	151
Consumer Portfolio Segment [Member]
Average recorded investment	2	3	2	3
Interest income recognized

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=118936363&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=118936363&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=118936363&loc=d3e5212-111524

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