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Note 4 - Loans Receivable and Allowance for Credit Losses on Loans - Schedule of Amortized Cost of Nonaccrual Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual, No Allowance		$ 1,737	$ 1,357
Financing Receivable, Nonaccrual, With Allowance		10,369	9,595
Financing Receivable, Nonaccrual	[1]	12,106	10,952
Real Estate Portfolio Segment [Member]
Financing Receivable, Nonaccrual, No Allowance		1,445	1,357
Financing Receivable, Nonaccrual, With Allowance		4,737	4,699
Financing Receivable, Nonaccrual	[1]	6,182	6,056
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Nonaccrual, No Allowance		1,102	1,088
Financing Receivable, Nonaccrual, With Allowance		0	0
Financing Receivable, Nonaccrual		1,102	1,088
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Nonaccrual, No Allowance		0	0
Financing Receivable, Nonaccrual, With Allowance		4,737	4,699
Financing Receivable, Nonaccrual	[1]	4,737	4,699
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		170	173
Financing Receivable, Nonaccrual, With Allowance		0	0
Financing Receivable, Nonaccrual	[1]	170	173
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		173	96
Financing Receivable, Nonaccrual, With Allowance		0	0
Financing Receivable, Nonaccrual	[1]	173	96
Consumer Portfolio Segment [Member]
Financing Receivable, Nonaccrual, No Allowance			0
Financing Receivable, Nonaccrual, With Allowance		2,583	2,213
Financing Receivable, Nonaccrual	[1]	2,583	2,213
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		0	0
Financing Receivable, Nonaccrual, With Allowance		2,195	1,863
Financing Receivable, Nonaccrual	[1]	2,195	1,863
Consumer Portfolio Segment [Member] | Marine Loans [Member]
Financing Receivable, Nonaccrual, No Allowance		0	0
Financing Receivable, Nonaccrual, With Allowance		385	342
Financing Receivable, Nonaccrual	[1]	385	342
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		0	0
Financing Receivable, Nonaccrual, With Allowance		3	8
Financing Receivable, Nonaccrual	[1]	3	8
Commercial Business Portfolio Segment [Member]
Financing Receivable, Nonaccrual	[1]	3,341	2,683
Commercial Business Portfolio Segment [Member] | Commercial Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		292	0
Financing Receivable, Nonaccrual, With Allowance		3,049	2,683
Financing Receivable, Nonaccrual	[1]	$ 3,341	$ 2,683
[1] Includes past due loans as applicable.

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- Definition

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+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (d)
-Publisher FASB
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