Note 6 - Loans and Allowance for Credit Losses on Loans (ACLL) (Details Textual)	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Accrued Interest and Fees Receivable on Loans	$ 14,600,000		$ 14,100,000
Financing Receivable, Modified, Number of Contracts	2	3
Financing Receivable, Modified, Accumulated	$ 188,000	$ 456,000
Financing Receivable, Modified, Commitment to Lend	0	$ 0
Loan Review Aggregate Exposure Amount on Nonhomogeneous Commercial Loan Relationships	5,000,000
Loans Collectively Evaluated Fully Guaranteed or Cash Secured Loans	9,800,000		9,200,000
Financing Receivable, Collectively Evaluated for Impairment, Allowance for Credit Loss, Fully Guaranteed or Cash Secured Loans	$ 0		$ 0
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Modified, Number of Contracts	1
Financing Receivable, Modified, Accumulated	$ 19,000