Note 4 - Loans Receivable and Allowance for Credit Losses - Summary of Allowance for Credit Losses of Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Financing receivable, allowance for credit losses, balance	$ 34,649	$ 32,573	$ 32,573
Financing receivable, allowance fore credit losses, charge-offs	0	0
Financing receivable, allowance for credit losses, recoveries	2	1
Financing receivable, allowance for credit losses, provision (benefit)	269	517
Financing receivable, allowance for credit losses, balance	34,921	33,091	34,649
Commercial Portfolio Segment [Member]
Financing receivable, allowance for credit losses, balance	1,008	1,097	1,097
Financing receivable, allowance fore credit losses, charge-offs	0	0	0
Financing receivable, allowance for credit losses, recoveries	2	1
Financing receivable, allowance for credit losses, provision (benefit)	21	(50)
Financing receivable, allowance for credit losses, balance	1,032	1,048	1,008
Construction Portfolio Segment [Member]
Financing receivable, allowance for credit losses, balance	4,032	3,037	3,037
Financing receivable, allowance fore credit losses, charge-offs	0	0	0
Financing receivable, allowance for credit losses, recoveries	0	0
Financing receivable, allowance for credit losses, provision (benefit)	(137)	(762)
Financing receivable, allowance for credit losses, balance	3,895	2,275	4,032
Real Estate Portfolio Segment [Member] \| Mortgage on Commercial Property Occupied by Owner [Member]
Financing receivable, allowance for credit losses, balance	2,239	1,871	1,871
Financing receivable, allowance fore credit losses, charge-offs	0	0	0
Financing receivable, allowance for credit losses, recoveries	0	0
Financing receivable, allowance for credit losses, provision (benefit)	(25)	599
Financing receivable, allowance for credit losses, balance	2,214	2,470	2,239
Real Estate Portfolio Segment [Member] \| Mortgage on Commercial Property Occupied by Non Owners [Member]
Financing receivable, allowance for credit losses, balance	9,661	6,300	6,300
Financing receivable, allowance fore credit losses, charge-offs	0	0	(202)
Financing receivable, allowance for credit losses, recoveries	0	0
Financing receivable, allowance for credit losses, provision (benefit)	(436)	1,061
Financing receivable, allowance for credit losses, balance	9,225	7,361	9,661
Real Estate Portfolio Segment [Member] \| Mortgage on Residential Properties Occupied by One to Four Families [Member]
Financing receivable, allowance for credit losses, balance	8,205	9,166	9,166
Financing receivable, allowance fore credit losses, charge-offs	0	0
Financing receivable, allowance for credit losses, recoveries	0	0
Financing receivable, allowance for credit losses, provision (benefit)	(274)	(352)
Financing receivable, allowance for credit losses, balance	7,931	8,814	8,205
Real Estate Portfolio Segment [Member] \| Mortgage on Residential Properties Occupied by One to Four Family Investment [Member]
Financing receivable, allowance for credit losses, balance	7,601	8,832	8,832
Financing receivable, allowance fore credit losses, charge-offs	0	0	0
Financing receivable, allowance for credit losses, recoveries	0	0
Financing receivable, allowance for credit losses, provision (benefit)	526	23
Financing receivable, allowance for credit losses, balance	8,127	8,855	7,601
Real Estate Portfolio Segment [Member] \| Mortgage on Residential Properties Occupied by Multifamily [Member]
Financing receivable, allowance for credit losses, balance	1,845	2,203	2,203
Financing receivable, allowance fore credit losses, charge-offs	0	0	0
Financing receivable, allowance for credit losses, recoveries	0	0
Financing receivable, allowance for credit losses, provision (benefit)	596	(1)
Financing receivable, allowance for credit losses, balance	2,441	2,202	1,845
Consumer Portfolio Segment [Member]
Financing receivable, allowance for credit losses, balance	58	67	67
Financing receivable, allowance fore credit losses, charge-offs	0	0	0
Financing receivable, allowance for credit losses, recoveries	0	0
Financing receivable, allowance for credit losses, provision (benefit)	(2)	(1)
Financing receivable, allowance for credit losses, balance	$ 56	$ 66	$ 58

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. 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 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. 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 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. 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 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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