Note 10 - Commitments and Contingencies (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Commitments And Contingencies Disclosure [Line Items]
Allowance for credit losses on unused commitments	$ 112,000	$ 106,000
Standby Letters of Credit [Member]
Commitments And Contingencies Disclosure [Line Items]
Financial instrument commitments expire within one year	$ 15,365,000
Maximum [Member]
Commitments And Contingencies Disclosure [Line Items]
Standby letters of credit expiration period	1 year
Lessee leasing arrangements, operating leases, renewal term	10 years
Minimum [Member]
Commitments And Contingencies Disclosure [Line Items]
Lessee leasing arrangements, operating leases, renewal term	5 years