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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
	Mar. 31, 2019	Mar. 31, 2018
Average recorded investment	$ 15,024	$ 15,529
Interest income recognized	185	344
Commercial And Industrial [Member]
Average recorded investment	2,198	5,631
Interest income recognized	30	187
Real Estate Construction Porfolio Segment [Member]
Average recorded investment	1,620	283
Interest income recognized	45
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Average recorded investment	1,913	2,892
Interest income recognized	12	21
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Average recorded investment	9,291	6,719
Interest income recognized	98	136
Consumer Portfolio Segment [Member]
Average recorded investment	2	4
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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Period Type:	duration

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

+ Details

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