Note 13 - Regulatory Capital and Oversight (Details Textual) $ in Millions	Sep. 30, 2021 USD ($)
Banks Tangible Assets	$ 992.6
Adjusted Assets	991.8
Banking Regulation, Risk-Weighted Assets, Actual	$ 690.2
Banking Regulation, Capital Conservation Buffer, Common Equity Tier One Risk-Based Capital, Actual	2.50

Capital conservation buffer percentage calculated as Common Equity Tier 1 risk-based capital ratio after deduction of minimum Common Equity Tier 1 risk-based capital ratio as defined by regulatory framework.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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