Note 9 - Borrowed Funds (Details Textual)	3 Months Ended			9 Months Ended
	Dec. 31, 2021 USD ($)		Sep. 30, 2020 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2020 USD ($)
Federal Funds Purchased	$ 146,000			$ 148,000
Long-Term Debt, Total	679,000			663,000
Subordinated Debt, Ending Balance	102,891,000	[1]		103,175,000
Number of Statutory Business Trusts					3
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust, Total	19,589,000	[1]		$ 19,589,000
Trust Preferred Securities Limited to Tier One Capital Elements Net of Goodwill				25.00%
Issued Fourth Quarter2021 [Member]
Debt Instrument, Face Amount	75,000,000
Debt Issuance Costs, Net, Total	1,740,000
Subordinated Debt, Ending Balance	$ 73,400,000			$ 73,600,000
Number of Maturity Years Remaining to Qualify as Tier2 Capital	5
Percent Reduction Each Year to Tier 2 Capital Until Subordinated Debt Maturity Date	20.00%
Subordinated Borrowing, Interest Rate	3.25%
Debt Instrument, Term (Year)	10 years
Number of Years Subordinated Debt Not Pre Payable (Year)	5 years
Issued Fourth Quarter2021 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	2.30%
Issued Third Quarter 2020 [Member]
Debt Instrument, Face Amount			$ 30,000,000		$ 30,000,000
Debt Issuance Costs, Net, Total			$ 681,000		$ 681,000
Subordinated Debt, Ending Balance	$ 29,500,000			$ 29,600,000
Number of Maturity Years Remaining to Qualify as Tier2 Capital			5
Percent Reduction Each Year to Tier 2 Capital Until Subordinated Debt Maturity Date			20.00%
Subordinated Borrowing, Interest Rate			5.00%
Debt Instrument, Term (Year)			10 years
Number of Years Subordinated Debt Not Pre Payable (Year)			5 years
Issued Third Quarter 2020 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate			4.87%
Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	5.34%			5.34%
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged				$ 1,810,000,000

[1] Derived from audited consolidated financial statements