Note 5 - Loans and Related Allowance for Loan and Lease Losses - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans, nonacrrual status	$ 8,879	$ 6,595
Loans, 90+ days past due and accruing	0	945
Commercial And Industrial [Member]
Loans, nonacrrual status	946	996
Loans, 90+ days past due and accruing	0	91
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Loans, nonacrrual status	3,285	2,731
Loans, 90+ days past due and accruing	0	754
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Loans [Member]
Loans, nonacrrual status	4,451	2,864
Loans, 90+ days past due and accruing	0	100
Consumer Portfolio Segment [Member]
Loans, nonacrrual status	197	4
Loans, 90+ days past due and accruing	$ 0	$ 0

Amount of financing receivable 90 days or more past due and still accruing.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 80
-URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant