Note 4 - Loans and Allowance for Loan Losses - Recorded Investment in Nonperforming Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2023		Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss		$ 565,576		$ 557,958
Nonperforming Financial Instruments [Member]
Nonaccrual, No Allowance		1,125	[1]	1,403
Nonaccrual		1,260
Past Due, Still Accruing		0		87
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss		1,260		1,490
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]
Nonaccrual, No Allowance	[1]	766
Nonaccrual		804
Past Due, Still Accruing		0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss		804
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Multifamily [Member]
Nonaccrual, No Allowance	[1]	0
Nonaccrual		0
Past Due, Still Accruing		0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss		0
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Nonaccrual, No Allowance				744
Past Due, Still Accruing				83
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss				827
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]
Nonaccrual, No Allowance				51
Past Due, Still Accruing				0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss				51
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]
Nonaccrual, No Allowance				0
Past Due, Still Accruing				0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss				0
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]
Nonaccrual, No Allowance		33	[1]	81
Nonaccrual		33
Past Due, Still Accruing		0		0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss		33		81
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]
Nonaccrual, No Allowance		274	[1]	372
Nonaccrual		344
Past Due, Still Accruing		0		0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss		344		372
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]
Nonaccrual, No Allowance		0	[1]	0
Nonaccrual		0
Past Due, Still Accruing		0		4
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss		0		4
Nonperforming Financial Instruments [Member] | Construction [Member] | One-to-four Family Residential Construction [Member]
Nonaccrual, No Allowance	[1]	0
Nonaccrual		0
Past Due, Still Accruing		0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss		0
Nonperforming Financial Instruments [Member] | Construction [Member] | Other Construction, Development and Land [Member]
Nonaccrual, No Allowance	[1]	52
Nonaccrual		52
Past Due, Still Accruing		0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss		52
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Nonaccrual, No Allowance		0	[1]	155
Nonaccrual		27
Past Due, Still Accruing		0		0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss		$ 27		$ 155

[1] Includes nonaccrual loans with no ACL and are also included in Total Nonaccrual loans of $1,260.