Note 4 - Loans and Allowance for Credit Losses on Loans - Outstanding TDRs (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Balance, TDR	$ 898
Specific Reserve Allocation	212
Additional Commitment to Lend	0
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied [Member]
Balance, TDR	888
Specific Reserve Allocation	202
Additional Commitment to Lend	0
Commercial and Industrial Portfolio Segment [Member] \| Term [Member]
Balance, TDR	10
Specific Reserve Allocation	10
Additional Commitment to Lend	$ 0

Accumulated amortized cost of financing receivable modified for debtor experiencing financial difficulty.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-33

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 310
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481746/310-40-50-4

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