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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		Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Nonaccrual, No Allowance		$ 1,357	$ 966
Financing Receivable, Nonaccrual, With Allowance		9,595	7,686
Financing Receivable, Nonaccrual	[1]	10,952	8,652
Real Estate Portfolio Segment [Member]
Financing Receivable, Nonaccrual, No Allowance		1,357	966
Financing Receivable, Nonaccrual, With Allowance		4,699	0
Financing Receivable, Nonaccrual	[1]	6,056	966
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Financing Receivable, Nonaccrual, No Allowance		1,088	0
Financing Receivable, Nonaccrual, With Allowance		0	0
Financing Receivable, Nonaccrual	[1]	1,088	0
Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Nonaccrual, No Allowance		0	0
Financing Receivable, Nonaccrual, With Allowance		4,699	0
Financing Receivable, Nonaccrual	[1]	4,699	0
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		173	46
Financing Receivable, Nonaccrual, With Allowance		0	0
Financing Receivable, Nonaccrual	[1]	173	46
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		96	920
Financing Receivable, Nonaccrual, With Allowance		0	0
Financing Receivable, Nonaccrual	[1]	96	920
Consumer Portfolio Segment [Member]
Financing Receivable, Nonaccrual, No Allowance			0
Financing Receivable, Nonaccrual, With Allowance		2,213	1,352
Financing Receivable, Nonaccrual	[1]	2,213	1,352
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		0	0
Financing Receivable, Nonaccrual, With Allowance		1,863	1,076
Financing Receivable, Nonaccrual	[1]	1,863	1,076
Consumer Portfolio Segment [Member] | Marine Loans [Member]
Financing Receivable, Nonaccrual, No Allowance		0	0
Financing Receivable, Nonaccrual, With Allowance		342	267
Financing Receivable, Nonaccrual	[1]	342	267
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		0	0
Financing Receivable, Nonaccrual, With Allowance		8	9
Financing Receivable, Nonaccrual	[1]	8	9
Commercial Business Portfolio Segment [Member]
Financing Receivable, Nonaccrual	[1]	2,683	6,334
Commercial Business Portfolio Segment [Member] | Commercial Loan [Member]
Financing Receivable, Nonaccrual, No Allowance		0	0
Financing Receivable, Nonaccrual, With Allowance		2,683	6,334
Financing Receivable, Nonaccrual	[1]	$ 2,683	$ 6,334
[1] Includes past due loans as applicable.

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- Definition

Amortized cost 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

Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ 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
-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
-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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (3)
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)
-Publisher SEC

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-7

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