Note 4 - Loans - Average Balance and Interest Income Recognized Related to Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Average Recorded Investment	$ 72,740	$ 91,353
Interest Income Recognized	1,074	2,394
Commercial Portfolio Segment [Member]
Average Recorded Investment	21,453	31,009
Interest Income Recognized	0	246
Real Estate Construction Portfolio Segment [Member]
Average Recorded Investment	3,805	4,408
Interest Income Recognized	0	294
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	38,047	41,649
Interest Income Recognized	1,044	1,602
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Average Recorded Investment	9,435	14,287
Interest Income Recognized	$ 30	$ 252

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

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

Name:	us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration