Note 1 - Summary of Significant Accounting Policies (Details Textual)			12 Months Ended
		Jan. 01, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 07, 2022 USD ($)	Dec. 31, 2019 USD ($)
Number of Operating Segments			2
Gain (Loss) on Disposition of Business			$ (870,000)	$ (0)	$ (0)
Mortgage Servicing Rights, Amortization Period (Year)			7 years
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total			$ 3,800,000	2,600,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance			0	0
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss			1,800,000	0
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Ending Balance			0	0
Retained Earnings (Accumulated Deficit), Ending Balance			439,898,000	391,201,000
Loans and Leases Receivable, Allowance, Impact of Accounting Policy Adoption					$ 8,221,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance		$ 3,850,000					$ 350,000
Cash Reserve Deposit Required and Made			$ 200,000	$ 200,000
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)			3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)			40 years
Transfer of Loans From Purchased Credit Impaired to Purchased Credit Deteriorated [Member]
Loans and Leases Receivable, Net Amount, Total		1,600,000
Accounting Standards Update 2016-13 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance		8,800,000
Loans and Leases Receivable, Allowance, Impact of Accounting Policy Adoption		8,200,000
Off-Balance Sheet, Credit Loss, Liability, Ending Balance	[1]	3,500,000
Deferred Tax Assets, Net of Valuation Allowance, Total		$ 2,900,000
Landmark Financial Advisors, LLC (LFA) [Member]
Gain (Loss) on Disposition of Business			$ (870,000)
Commonwealth [Member]
Business Acquisition, Percentage of Voting Interests Acquired						100.00%
Off-Balance Sheet, Credit Loss, Liability, Ending Balance						$ 500,000
Landmark Financial Advisors, LLC (LFA) [Member]
Business Acquisition, Percentage of Voting Interests Acquired						60.00%

[1] The impact of the ASC 326 adoption on the ACL on loans reflects $8.2 million related to the transition from the incurred loss ACL model to the CECL ACL model and $1.6 million related to the transition from PCI to PCD methodology as defined in thestandard.