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Note 3 - Loans Receivable and Allowance for Credit Losses on Loans - Schedule of Amortized Cost of Nonaccrual Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual, No Allowance		$ 3,102	$ 1,357
Financing Receivable, Nonaccrual, With Allowance		7,670	9,595
Financing Receivable, Nonaccrual	[1]	10,772	10,952
Real Estate Portfolio Segment [Member]
Financing Receivable, Nonaccrual, No Allowance		1,452	1,357
Financing Receivable, Nonaccrual, With Allowance		4,737	4,699
Financing Receivable, Nonaccrual	[1]	6,189	6,056
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Nonaccrual, No Allowance		1,130	1,088
Financing Receivable, Nonaccrual, With Allowance		0	0
Financing Receivable, Nonaccrual		1,130	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		156	173
Financing Receivable, Nonaccrual, With Allowance		0	0
Financing Receivable, Nonaccrual	[1]	156	173
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		166	96
Financing Receivable, Nonaccrual, With Allowance		0	0
Financing Receivable, Nonaccrual	[1]	166	96
Consumer Portfolio Segment [Member]
Financing Receivable, Nonaccrual, No Allowance			0
Financing Receivable, Nonaccrual, With Allowance		2,008	2,213
Financing Receivable, Nonaccrual	[1]	2,008	2,213
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		0	0
Financing Receivable, Nonaccrual, With Allowance		1,770	1,863
Financing Receivable, Nonaccrual	[1]	1,770	1,863
Consumer Portfolio Segment [Member] | Marine Loans [Member]
Financing Receivable, Nonaccrual, No Allowance		0	0
Financing Receivable, Nonaccrual, With Allowance		233	342
Financing Receivable, Nonaccrual	[1]	233	342
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		0	0
Financing Receivable, Nonaccrual, With Allowance		5	8
Financing Receivable, Nonaccrual	[1]	5	8
Commercial Business Portfolio Segment [Member]
Financing Receivable, Nonaccrual	[1]	2,575	2,683
Commercial Business Portfolio Segment [Member] | Commercial And Industrial [Member]
Financing Receivable, Nonaccrual, No Allowance		1,650	0
Financing Receivable, Nonaccrual, With Allowance		925	2,683
Financing Receivable, Nonaccrual	[1]	$ 2,575	$ 2,683
[1] Includes loans less than 90 days past due as applicable.

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- Definition

Amortized cost excluding accrued interest, of financing receivable on nonaccrual status with allowance for credit loss. Excludes net investment in lease.

+ References

No definition available.

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- Definition

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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 (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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