Note 4 - Loans and Allowance for Credit Losses - Class of Loans Risk Category (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Year One	$ 25,123		$ 132,796
Financing Receivable, Year Two	135,877		155,608
Financing Receivable, Year Three	153,063		93,560
Financing Receivable, Year Four	89,157		48,815
Financing Receivable, Year Five	46,114		40,589
Financing Receivable, Prior	116,085		81,696
Financing Receivable, Revolving	64,188		69,350
Financing Receivable, amortized cost	629,607		622,414
Current period gross write-offs, Year One	0
Current period gross write-offs, Year Two	21
Current period gross write-offs, Year Three	43
Current period gross write-offs, Year Four	15
Current period gross write-offs, Year Five	4
Current period gross write-offs, Prior	3
Current period gross write-offs, Revolving	14
Current period gross write-offs, Total	100	$ 275
Pass [Member]
Financing Receivable, Year One	24,770		131,765
Financing Receivable, Year Two	134,886		153,463
Financing Receivable, Year Three	150,901		92,602
Financing Receivable, Year Four	88,246		46,761
Financing Receivable, Year Five	44,087		39,445
Financing Receivable, Prior	110,306		79,380
Financing Receivable, Revolving	63,520		68,417
Financing Receivable, amortized cost	616,716		611,833
Special Mention [Member]
Financing Receivable, Year One	41		1,031
Financing Receivable, Year Two	163		2,097
Financing Receivable, Year Three	87		679
Financing Receivable, Year Four	98		1,670
Financing Receivable, Year Five	1,658		577
Financing Receivable, Prior	3,200		255
Financing Receivable, Revolving	496		749
Financing Receivable, amortized cost	5,743		7,058
Substandard [Member]
Financing Receivable, Year One	312		0
Financing Receivable, Year Two	828		0
Financing Receivable, Year Three	2,029		0
Financing Receivable, Year Four	568		306
Financing Receivable, Year Five	292		303
Financing Receivable, Prior	1,267		980
Financing Receivable, Revolving	172		184
Financing Receivable, amortized cost	5,468		1,773
Doubtful [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		48
Financing Receivable, Year Three	46		279
Financing Receivable, Year Four	245		78
Financing Receivable, Year Five	77		264
Financing Receivable, Prior	1,312		1,081
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	1,680		1,750
One-to-four Family Loan [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	4,599		34,344
Financing Receivable, Year Two	33,843		31,599
Financing Receivable, Year Three	30,000		26,038
Financing Receivable, Year Four	25,116		7,066
Financing Receivable, Year Five	6,826		9,790
Financing Receivable, Prior	33,139		24,764
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	133,523		133,601
Current period gross write-offs, Year One	0
Current period gross write-offs, Year Two	0
Current period gross write-offs, Year Three	0
Current period gross write-offs, Year Four	0
Current period gross write-offs, Year Five	0
Current period gross write-offs, Prior	1
Current period gross write-offs, Revolving	0
Current period gross write-offs, Total	1	2
One-to-four Family Loan [Member] | Pass [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	4,599		34,344
Financing Receivable, Year Two	33,843		31,551
Financing Receivable, Year Three	29,954		25,846
Financing Receivable, Year Four	24,957		6,913
Financing Receivable, Year Five	6,675		9,525
Financing Receivable, Prior	31,576		23,628
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	131,604		131,807
One-to-four Family Loan [Member] | Special Mention [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	335		144
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	335		144
One-to-four Family Loan [Member] | Substandard [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		75
Financing Receivable, Year Five	74		265
Financing Receivable, Prior	416		155
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	490		495
One-to-four Family Loan [Member] | Doubtful [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		48
Financing Receivable, Year Three	46		192
Financing Receivable, Year Four	159		78
Financing Receivable, Year Five	77		0
Financing Receivable, Prior	812		837
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	1,094		1,155
One-to-four Family Residential Construction [Member] | Construction [Member]
Financing Receivable, Year One	1,352		9,193
Financing Receivable, Year Two	8,733		4,180
Financing Receivable, Year Three	3,671		918
Financing Receivable, Year Four	717		1,119
Financing Receivable, Year Five	292		0
Financing Receivable, Prior	1,155		257
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	15,920		15,667
Current period gross write-offs, Year One	0
Current period gross write-offs, Year Two	0
Current period gross write-offs, Year Three	0
Current period gross write-offs, Year Four	0
Current period gross write-offs, Year Five	0
Current period gross write-offs, Prior	0
Current period gross write-offs, Revolving	0
Current period gross write-offs, Total	(0)	(0)
One-to-four Family Residential Construction [Member] | Pass [Member] | Construction [Member]
Financing Receivable, Year One	1,352		9,193
Financing Receivable, Year Two	8,733		4,180
Financing Receivable, Year Three	3,671		831
Financing Receivable, Year Four	631		1,119
Financing Receivable, Year Five	292		0
Financing Receivable, Prior	1,155		257
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	15,834		15,580
One-to-four Family Residential Construction [Member] | Special Mention [Member] | Construction [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	0		0
One-to-four Family Residential Construction [Member] | Substandard [Member] | Construction [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	0		0
One-to-four Family Residential Construction [Member] | Doubtful [Member] | Construction [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		87
Financing Receivable, Year Four	86		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	86		87
Other Consumer Loan [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Year One	5,509		23,335
Financing Receivable, Year Two	20,973		13,906
Financing Receivable, Year Three	12,212		7,662
Financing Receivable, Year Four	6,466		2,604
Financing Receivable, Year Five	2,003		846
Financing Receivable, Prior	5,558		5,446
Financing Receivable, Revolving	2,299		2,574
Financing Receivable, amortized cost	55,020		56,373
Current period gross write-offs, Year One	0
Current period gross write-offs, Year Two	21
Current period gross write-offs, Year Three	43
Current period gross write-offs, Year Four	15
Current period gross write-offs, Year Five	4
Current period gross write-offs, Prior	2
Current period gross write-offs, Revolving	14
Current period gross write-offs, Total	99
Other Consumer Loan [Member] | Pass [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Year One	5,509		23,335
Financing Receivable, Year Two	20,973		13,906
Financing Receivable, Year Three	12,212		7,662
Financing Receivable, Year Four	6,466		2,604
Financing Receivable, Year Five	2,003		846
Financing Receivable, Prior	5,558		5,446
Financing Receivable, Revolving	2,221		2,484
Financing Receivable, amortized cost	54,942		56,283
Other Consumer Loan [Member] | Special Mention [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	0		0
Other Consumer Loan [Member] | Substandard [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	78		90
Financing Receivable, amortized cost	78		90
Other Consumer Loan [Member] | Doubtful [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	0		0
Commercial Real Estate Loan [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Year One	8,334		15,641
Financing Receivable, Year Two	18,154		40,675
Financing Receivable, Year Three	40,382		30,229
Financing Receivable, Year Four	29,414		21,442
Financing Receivable, Year Five	21,017		18,648
Financing Receivable, Prior	56,440		39,705
Financing Receivable, Revolving	1,076		2,305
Financing Receivable, amortized cost	174,817		168,645
Current period gross write-offs, Year One	0
Current period gross write-offs, Year Two	0
Current period gross write-offs, Year Three	0
Current period gross write-offs, Year Four	0
Current period gross write-offs, Year Five	0
Current period gross write-offs, Prior	0
Current period gross write-offs, Revolving	0
Current period gross write-offs, Total	0
Commercial Real Estate Loan [Member] | Commercial Portfolio Segment [Member]
Current period gross write-offs, Total	(0)	(0)
Commercial Real Estate Loan [Member] | Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Year One	8,022		14,818
Financing Receivable, Year Two	17,337		40,675
Financing Receivable, Year Three	40,382		29,656
Financing Receivable, Year Four	28,846		19,589
Financing Receivable, Year Five	19,189		18,231
Financing Receivable, Prior	52,967		38,818
Financing Receivable, Revolving	826		1,755
Financing Receivable, amortized cost	167,569		163,542
Commercial Real Estate Loan [Member] | Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Year One	0		823
Financing Receivable, Year Two	98		0
Financing Receivable, Year Three	0		573
Financing Receivable, Year Four	0		1,622
Financing Receivable, Year Five	1,610		417
Financing Receivable, Prior	2,659		62
Financing Receivable, Revolving	250		550
Financing Receivable, amortized cost	4,617		4,047
Commercial Real Estate Loan [Member] | Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Year One	312		0
Financing Receivable, Year Two	719		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	568		231
Financing Receivable, Year Five	218		0
Financing Receivable, Prior	814		825
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	2,631		1,056
Commercial Real Estate Loan [Member] | Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	0		0
Home Equity and Second Mortgage [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	608		5,267
Financing Receivable, Year Two	5,073		4,380
Financing Receivable, Year Three	4,172		529
Financing Receivable, Year Four	485		232
Financing Receivable, Year Five	214		427
Financing Receivable, Prior	867		517
Financing Receivable, Revolving	49,573		51,949
Financing Receivable, amortized cost	60,992		63,301
Current period gross write-offs, Year One	0
Current period gross write-offs, Year Two	0
Current period gross write-offs, Year Three	0
Current period gross write-offs, Year Four	0
Current period gross write-offs, Year Five	0
Current period gross write-offs, Prior	0
Current period gross write-offs, Revolving	0
Current period gross write-offs, Total	0
Home Equity and Second Mortgage [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, amortized cost	60,992		63,301
Current period gross write-offs, Total	(0)	(0)
Home Equity and Second Mortgage [Member] | Pass [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	608		5,267
Financing Receivable, Year Two	5,073		4,380
Financing Receivable, Year Three	4,172		529
Financing Receivable, Year Four	485		232
Financing Receivable, Year Five	214		163
Financing Receivable, Prior	421		327
Financing Receivable, Revolving	49,418		51,794
Financing Receivable, amortized cost	60,391		62,692
Home Equity and Second Mortgage [Member] | Special Mention [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	61		61
Financing Receivable, amortized cost	61		61
Home Equity and Second Mortgage [Member] | Substandard [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	94		94
Financing Receivable, amortized cost	94		94
Home Equity and Second Mortgage [Member] | Doubtful [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		264
Financing Receivable, Prior	446		190
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	446		454
Commercial Business [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Year One	2,839		14,925
Financing Receivable, Year Two	14,705		14,700
Financing Receivable, Year Three	14,306		11,155
Financing Receivable, Year Four	10,399		5,754
Financing Receivable, Year Five	5,529		5,510
Financing Receivable, Prior	8,638		3,646
Financing Receivable, Revolving	11,240		12,522
Financing Receivable, amortized cost	67,656		68,212
Current period gross write-offs, Year One	0
Current period gross write-offs, Year Two	0
Current period gross write-offs, Year Three	0
Current period gross write-offs, Year Four	0
Current period gross write-offs, Year Five	0
Current period gross write-offs, Prior	0
Current period gross write-offs, Revolving	0
Current period gross write-offs, Total	(0)	155
Commercial Business [Member] | Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Year One	2,798		14,717
Financing Receivable, Year Two	14,531		12,603
Financing Receivable, Year Three	12,190		11,049
Financing Receivable, Year Four	10,301		5,706
Financing Receivable, Year Five	5,481		5,312
Financing Receivable, Prior	8,443		3,646
Financing Receivable, Revolving	11,055		12,384
Financing Receivable, amortized cost	64,799		65,417
Commercial Business [Member] | Special Mention [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Year One	41		208
Financing Receivable, Year Two	65		2,097
Financing Receivable, Year Three	87		106
Financing Receivable, Year Four	98		48
Financing Receivable, Year Five	48		160
Financing Receivable, Prior	158		0
Financing Receivable, Revolving	185		138
Financing Receivable, amortized cost	682		2,757
Commercial Business [Member] | Substandard [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	109		0
Financing Receivable, Year Three	2,029		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		38
Financing Receivable, Prior	37		0
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	2,175		38
Commercial Business [Member] | Doubtful [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	0		0
Other Construction, Development and Land [Member] | Construction [Member]
Financing Receivable, Year One	1,882		26,717
Financing Receivable, Year Two	31,037		35,673
Financing Receivable, Year Three	34,947		7,495
Financing Receivable, Year Four	3,900		2,655
Financing Receivable, Year Five	2,355		1,231
Financing Receivable, Prior	3,958		2,898
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	78,079		76,669
Current period gross write-offs, Year One	0
Current period gross write-offs, Year Two	0
Current period gross write-offs, Year Three	0
Current period gross write-offs, Year Four	0
Current period gross write-offs, Year Five	0
Current period gross write-offs, Prior	0
Current period gross write-offs, Revolving	0
Current period gross write-offs, Total	(0)	(0)
Other Construction, Development and Land [Member] | Pass [Member] | Construction [Member]
Financing Receivable, Year One	1,882		26,717
Financing Receivable, Year Two	31,037		35,673
Financing Receivable, Year Three	34,947		7,495
Financing Receivable, Year Four	3,900		2,655
Financing Receivable, Year Five	2,355		1,231
Financing Receivable, Prior	3,856		2,795
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	77,977		76,566
Other Construction, Development and Land [Member] | Special Mention [Member] | Construction [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	48		49
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	48		49
Other Construction, Development and Land [Member] | Substandard [Member] | Construction [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	0		0
Other Construction, Development and Land [Member] | Doubtful [Member] | Construction [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	54		54
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	54		54
Multifamily [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	0		3,374
Financing Receivable, Year Two	3,359		10,495
Financing Receivable, Year Three	13,373		9,534
Financing Receivable, Year Four	12,660		7,943
Financing Receivable, Year Five	7,878		4,137
Financing Receivable, Prior	6,330		4,463
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	43,600		39,946
Current period gross write-offs, Year One	0
Current period gross write-offs, Year Two	0
Current period gross write-offs, Year Three	0
Current period gross write-offs, Year Four	0
Current period gross write-offs, Year Five	0
Current period gross write-offs, Prior	0
Current period gross write-offs, Revolving	0
Current period gross write-offs, Total	(0)	$ (0)
Multifamily [Member] | Pass [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	0		3,374
Financing Receivable, Year Two	3,359		10,495
Financing Receivable, Year Three	13,373		9,534
Financing Receivable, Year Four	12,660		7,943
Financing Receivable, Year Five	7,878		4,137
Financing Receivable, Prior	6,330		4,463
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	43,600		39,946
Multifamily [Member] | Special Mention [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	0		0
Multifamily [Member] | Substandard [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	0
Financing Receivable, Year Two	0
Financing Receivable, Year Three	0
Financing Receivable, Year Four	0
Financing Receivable, Year Five	0
Financing Receivable, Prior	0
Financing Receivable, Revolving	0
Financing Receivable, amortized cost	0
Multifamily [Member] | Doubtful [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Year One	0		0
Financing Receivable, Year Two	0		0
Financing Receivable, Year Three	0		0
Financing Receivable, Year Four	0		0
Financing Receivable, Year Five	0		0
Financing Receivable, Prior	0		0
Financing Receivable, Revolving	0		0
Financing Receivable, amortized cost	$ 0		$ 0