Note 7 - Loans and Allowance for Credit Losses on Loans - Financing Receivable, Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Modifications	$ 11,007
Percentage of total class of financing receivable	0.30%
Payment Deferral [Member]
Modifications	$ 107
Extended Maturity [Member]
Modifications	10,834
Extended Maturity and Payment Deferral [Member]
Modifications	66
Commercial Loan [Member]
Modifications	$ 307
Percentage of total class of financing receivable	0.10%
Commercial Loan [Member] | Payment Deferral [Member]
Modifications	$ 0
Commercial Loan [Member] | Extended Maturity [Member]
Modifications	307
Commercial Loan [Member] | Extended Maturity and Payment Deferral [Member]
Modifications	0
Commercial Real Estate Owner Occupied, Other [Member]
Modifications	$ 35
Percentage of total class of financing receivable	0.00%
Commercial Real Estate Owner Occupied, Other [Member] | Payment Deferral [Member]
Modifications	$ 0
Commercial Real Estate Owner Occupied, Other [Member] | Extended Maturity [Member]
Modifications	35
Commercial Real Estate Owner Occupied, Other [Member] | Extended Maturity and Payment Deferral [Member]
Modifications	0
Multifamily [Member]
Modifications	$ 9,760
Percentage of total class of financing receivable	3.20%
Multifamily [Member] | Payment Deferral [Member]
Modifications	$ 0
Multifamily [Member] | Extended Maturity [Member]
Modifications	9,760
Multifamily [Member] | Extended Maturity and Payment Deferral [Member]
Modifications	0
Commercial Real Estate Nonowner Occupied, Retail [Member]
Modifications	$ 387
Percentage of total class of financing receivable	0.20%
Commercial Real Estate Nonowner Occupied, Retail [Member] | Payment Deferral [Member]
Modifications	$ 0
Commercial Real Estate Nonowner Occupied, Retail [Member] | Extended Maturity [Member]
Modifications	387
Commercial Real Estate Nonowner Occupied, Retail [Member] | Extended Maturity and Payment Deferral [Member]
Modifications	0
Residential 1-4 Family Real Estate, Personal Residence [Member]
Modifications	$ 173
Percentage of total class of financing receivable	0.00%
Residential 1-4 Family Real Estate, Personal Residence [Member] | Payment Deferral [Member]
Modifications	$ 107
Residential 1-4 Family Real Estate, Personal Residence [Member] | Extended Maturity [Member]
Modifications	0
Residential 1-4 Family Real Estate, Personal Residence [Member] | Extended Maturity and Payment Deferral [Member]
Modifications	66
Residential 1-4 Family Real Estate, Rental Small Loan [Member]
Modifications	$ 345
Percentage of total class of financing receivable	0.20%
Residential 1-4 Family Real Estate, Rental Small Loan [Member] | Payment Deferral [Member]
Modifications	$ 0
Residential 1-4 Family Real Estate, Rental Small Loan [Member] | Extended Maturity [Member]
Modifications	345
Residential 1-4 Family Real Estate, Rental Small Loan [Member] | Extended Maturity and Payment Deferral [Member]
Modifications	$ 0