Note 10 - Financial Instruments - Significant Unobservable Inputs Used Fair Value Measurements (Details) Pure in Thousands, $ in Thousands	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Minimum [Member] \| Measurement Input, Discount Rate [Member]
Impaired loans, significant unobservable inputs	0
Impaired Loans [Member]
Assets at fair value	$ 189	$ 199

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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