Note 7 - Loans and Related Allowance for Credit Losses - Classes of the Loan Portfolio Summarized by Credit Quality (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Term loans amortized, current year		$ 29,420		$ 153,526
Term loans amortized, one year before		160,226		254,581
Term loans amortized, two years before		256,829		260,086
Term loans amortized, three years before		254,303		182,142
Term loans amortized, four years before		177,971		111,764
Term loans amortized, prior		421,501		321,137
Term loans amortized, revolving		250,099		236,378
Loans	[1],[2]	1,550,349		1,519,614
Current-period gross charge-offs, total		54	$ 7
Pass [Member]
Term loans amortized, current year		29,420		150,041
Term loans amortized, one year before		159,063		253,841
Term loans amortized, two years before		255,432		248,224
Term loans amortized, three years before		243,152		180,483
Term loans amortized, four years before		176,308		111,425
Term loans amortized, prior		383,050		282,320
Term loans amortized, revolving		246,718		233,892
Loans		1,493,143		1,460,226
Special Mention [Member]
Term loans amortized, current year		0		2,263
Term loans amortized, one year before		0		0
Term loans amortized, two years before		565		3,340
Term loans amortized, three years before		2,507		389
Term loans amortized, four years before		383		0
Term loans amortized, prior		2,959		2,995
Term loans amortized, revolving		1,721		832
Loans		8,135		9,819
Substandard [Member]
Term loans amortized, current year		0		1,222
Term loans amortized, one year before		1,163		740
Term loans amortized, two years before		832		8,522
Term loans amortized, three years before		8,644		1,270
Term loans amortized, four years before		1,280		339
Term loans amortized, prior		35,492		35,822
Term loans amortized, revolving		1,659		1,654
Loans		49,070		49,569
Unlikely to be Collected Financing Receivable [Member]
Term loans amortized, current year		0
Term loans amortized, one year before		0
Term loans amortized, two years before		0
Term loans amortized, three years before		0
Term loans amortized, four years before		0
Term loans amortized, prior		0
Term loans amortized, revolving		1
Loans		1
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]
Term loans amortized, current year		4,247		13,398
Term loans amortized, one year before		11,965		20,265
Term loans amortized, two years before		19,720		37,924
Term loans amortized, three years before		37,262		39,414
Term loans amortized, four years before		43,678		25,532
Term loans amortized, prior		63,910		40,520
Term loans amortized, revolving		4,630		4,394
Loans	[1],[2]	185,412		181,447
Current-period gross charge-offs current		0		0
Current-period gross charge-offs one year before		0		0
Current-period gross charge-offs, two years before		0		0
Current-period gross charge-offs, three years before		0		0
Current-period gross charge-offs, four years before		0		0
Current-period gross charge-offs, prior		0		45
Current-period gross charge-offs, revolving		0		0
Current-period gross charge-offs, total		(0)	(0)	45
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Pass [Member]
Term loans amortized, current year		4,247		12,424
Term loans amortized, one year before		11,016		20,265
Term loans amortized, two years before		19,720		33,389
Term loans amortized, three years before		32,740		39,025
Term loans amortized, four years before		43,295		25,532
Term loans amortized, prior		62,859		39,393
Term loans amortized, revolving		4,630		4,394
Loans		178,507		174,422
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Special Mention [Member]
Term loans amortized, current year		0		0
Term loans amortized, one year before		0		0
Term loans amortized, two years before		0		0
Term loans amortized, three years before		0		389
Term loans amortized, four years before		383		0
Term loans amortized, prior		765		772
Term loans amortized, revolving		0		0
Loans		1,148		1,161
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Substandard [Member]
Term loans amortized, current year		0		974
Term loans amortized, one year before		949		0
Term loans amortized, two years before		0		4,535
Term loans amortized, three years before		4,522		0
Term loans amortized, four years before		0		0
Term loans amortized, prior		286		355
Term loans amortized, revolving		0		0
Loans		5,757		5,864
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]
Term loans amortized, current year		9,492		7,542
Term loans amortized, one year before		7,504		63,559
Term loans amortized, two years before		61,388		102,849
Term loans amortized, three years before		102,350		49,644
Term loans amortized, four years before		47,187		20,230
Term loans amortized, prior		184,654		167,562
Term loans amortized, revolving		1,046		905
Loans	[1],[2]	413,621		412,291
Current-period gross charge-offs current		0		0
Current-period gross charge-offs one year before		0		0
Current-period gross charge-offs, two years before		0		0
Current-period gross charge-offs, three years before		0		0
Current-period gross charge-offs, four years before		0		0
Current-period gross charge-offs, prior		0		1,341
Current-period gross charge-offs, revolving		0		0
Current-period gross charge-offs, total		(0)	(0)	1,341
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Pass [Member]
Term loans amortized, current year		9,492		7,542
Term loans amortized, one year before		7,504		63,559
Term loans amortized, two years before		61,388		96,624
Term loans amortized, three years before		96,175		49,009
Term loans amortized, four years before		46,552		20,230
Term loans amortized, prior		151,416		133,530
Term loans amortized, revolving		1,046		905
Loans		373,573		371,399
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Special Mention [Member]
Term loans amortized, current year		0		0
Term loans amortized, one year before		0		0
Term loans amortized, two years before		0		2,506
Term loans amortized, three years before		2,507		0
Term loans amortized, four years before		0		0
Term loans amortized, prior		1,984		2,002
Term loans amortized, revolving		0		0
Loans		4,491		4,508
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Substandard [Member]
Term loans amortized, current year		0		0
Term loans amortized, one year before		0		0
Term loans amortized, two years before		0		3,719
Term loans amortized, three years before		3,668		635
Term loans amortized, four years before		635		0
Term loans amortized, prior		31,254		32,030
Term loans amortized, revolving		0		0
Loans		35,557		36,384
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]
Term loans amortized, current year		0		2,930
Term loans amortized, one year before		2,912		36,113
Term loans amortized, two years before		36,114		21,978
Term loans amortized, three years before		21,870		7,437
Term loans amortized, four years before		7,382		10,057
Term loans amortized, prior		20,459		11,324
Term loans amortized, revolving		0		10
Loans	[1],[2]	88,737		89,849
Current-period gross charge-offs current		0		0
Current-period gross charge-offs one year before		0		0
Current-period gross charge-offs, two years before		0		0
Current-period gross charge-offs, three years before		0		0
Current-period gross charge-offs, four years before		0		0
Current-period gross charge-offs, prior		0		0
Current-period gross charge-offs, revolving		0		0
Current-period gross charge-offs, total		(0)	(0)	0
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Pass [Member]
Term loans amortized, current year		0		2,930
Term loans amortized, one year before		2,912		36,113
Term loans amortized, two years before		36,114		21,978
Term loans amortized, three years before		21,870		7,437
Term loans amortized, four years before		7,382		10,057
Term loans amortized, prior		20,459		11,324
Term loans amortized, revolving		0		10
Loans		88,737		89,849
Residential Portfolio Segment [Member]
Term loans amortized, current year		7,506		45,381
Term loans amortized, one year before		44,694		50,989
Term loans amortized, two years before		49,465		62,078
Term loans amortized, three years before		61,156		70,617
Term loans amortized, four years before		68,662		36,067
Term loans amortized, prior		119,650		88,019
Term loans amortized, revolving		141		291
Loans	[1],[2]	351,274		353,442
Current-period gross charge-offs current		0		0
Current-period gross charge-offs one year before		0		0
Current-period gross charge-offs, two years before		0		0
Current-period gross charge-offs, three years before		0		0
Current-period gross charge-offs, four years before		0		0
Current-period gross charge-offs, prior		1		0
Current-period gross charge-offs, revolving		0		0
Current-period gross charge-offs, total		1	(0)	0
Residential Portfolio Segment [Member] | Pass [Member]
Term loans amortized, current year		7,506		45,347
Term loans amortized, one year before		44,694		50,820
Term loans amortized, two years before		49,301		61,963
Term loans amortized, three years before		60,850		69,982
Term loans amortized, four years before		68,027		36,067
Term loans amortized, prior		117,913		86,492
Term loans amortized, revolving		141		291
Loans		348,432		350,962
Residential Portfolio Segment [Member] | Substandard [Member]
Term loans amortized, current year		0		34
Term loans amortized, one year before		0		169
Term loans amortized, two years before		164		115
Term loans amortized, three years before		306		635
Term loans amortized, four years before		635		0
Term loans amortized, prior		1,737		1,527
Term loans amortized, revolving		0		0
Loans		2,842		2,480
Commercial And Industrial [Member]
Term loans amortized, current year		7,186		51,131
Term loans amortized, one year before		49,075		33,870
Term loans amortized, two years before		33,438		31,305
Term loans amortized, three years before		28,922		13,512
Term loans amortized, four years before		9,893		19,169
Term loans amortized, prior		23,845		4,972
Term loans amortized, revolving		83,188		75,075
Loans	[1],[2]	235,547		229,034
Current-period gross charge-offs current		0		0
Current-period gross charge-offs one year before		0		180
Current-period gross charge-offs, two years before		0		23
Current-period gross charge-offs, three years before		0		12
Current-period gross charge-offs, four years before		0		0
Current-period gross charge-offs, prior		5		0
Current-period gross charge-offs, revolving		0		0
Current-period gross charge-offs, total		5	(0)	215
Commercial And Industrial [Member] | Pass [Member]
Term loans amortized, current year		7,186		48,654
Term loans amortized, one year before		48,861		33,860
Term loans amortized, two years before		32,864		31,305
Term loans amortized, three years before		28,922		13,512
Term loans amortized, four years before		9,883		18,864
Term loans amortized, prior		23,475		4,888
Term loans amortized, revolving		81,394		74,169
Loans		232,585		225,252
Commercial And Industrial [Member] | Special Mention [Member]
Term loans amortized, current year		0		2,263
Term loans amortized, one year before		0		0
Term loans amortized, two years before		565		0
Term loans amortized, three years before		0		0
Term loans amortized, four years before		0		0
Term loans amortized, prior		0		0
Term loans amortized, revolving		1,721		832
Loans		2,286		3,095
Commercial And Industrial [Member] | Substandard [Member]
Term loans amortized, current year		0		214
Term loans amortized, one year before		214		10
Term loans amortized, two years before		9		0
Term loans amortized, three years before		0		0
Term loans amortized, four years before		10		305
Term loans amortized, prior		370		84
Term loans amortized, revolving		72		74
Loans		675		687
Commercial And Industrial [Member] | Unlikely to be Collected Financing Receivable [Member]
Term loans amortized, current year		0
Term loans amortized, one year before		0
Term loans amortized, two years before		0
Term loans amortized, three years before		0
Term loans amortized, four years before		0
Term loans amortized, prior		0
Term loans amortized, revolving		1
Loans		1
Home Equity Lines of Credit [Member]
Term loans amortized, current year		0		244
Term loans amortized, one year before		358		68
Term loans amortized, two years before		188		316
Term loans amortized, three years before		343		183
Term loans amortized, four years before		0		167
Term loans amortized, prior		2,805		2,534
Term loans amortized, revolving		143,460		139,867
Loans	[1],[2]	147,154		143,379
Current-period gross charge-offs current		0		0
Current-period gross charge-offs one year before		0		0
Current-period gross charge-offs, two years before		0		0
Current-period gross charge-offs, three years before		0		0
Current-period gross charge-offs, four years before		0		0
Current-period gross charge-offs, prior		4		7
Current-period gross charge-offs, revolving		0		0
Current-period gross charge-offs, total		4	7	7
Home Equity Lines of Credit [Member] | Pass [Member]
Term loans amortized, current year		0		244
Term loans amortized, one year before		358		0
Term loans amortized, two years before		22		166
Term loans amortized, three years before		195		183
Term loans amortized, four years before		0		133
Term loans amortized, prior		2,166		2,041
Term loans amortized, revolving		142,963		139,214
Loans		145,704		141,981
Home Equity Lines of Credit [Member] | Substandard [Member]
Term loans amortized, current year		0		0
Term loans amortized, one year before		0		68
Term loans amortized, two years before		166		150
Term loans amortized, three years before		148		0
Term loans amortized, four years before		0		34
Term loans amortized, prior		639		493
Term loans amortized, revolving		497		653
Loans		1,450		1,398
Construction and Other [Member]
Term loans amortized, current year		705		31,361
Term loans amortized, one year before		42,390		48,670
Term loans amortized, two years before		55,620		3,252
Term loans amortized, three years before		2,110		1,223
Term loans amortized, four years before		1,080		506
Term loans amortized, prior		3,114		2,760
Term loans amortized, revolving		17,634		15,836
Loans	[1],[2]	122,653		103,608
Current-period gross charge-offs current		0		0
Current-period gross charge-offs one year before		0		0
Current-period gross charge-offs, two years before		0		0
Current-period gross charge-offs, three years before		0		0
Current-period gross charge-offs, four years before		0		0
Current-period gross charge-offs, prior		0		0
Current-period gross charge-offs, revolving		0		0
Current-period gross charge-offs, total		(0)	(0)	0
Construction and Other [Member] | Pass [Member]
Term loans amortized, current year		705		31,361
Term loans amortized, one year before		42,390		48,177
Term loans amortized, two years before		55,127		2,418
Term loans amortized, three years before		2,110		1,223
Term loans amortized, four years before		1,080		506
Term loans amortized, prior		1,858		1,368
Term loans amortized, revolving		16,544		14,909
Loans		119,814		99,962
Construction and Other [Member] | Special Mention [Member]
Term loans amortized, current year		0		0
Term loans amortized, one year before		0		0
Term loans amortized, two years before		0		834
Term loans amortized, three years before		0		0
Term loans amortized, four years before		0		0
Term loans amortized, prior		210		221
Term loans amortized, revolving		0		0
Loans		210		1,055
Construction and Other [Member] | Substandard [Member]
Term loans amortized, current year		0		0
Term loans amortized, one year before		0		493
Term loans amortized, two years before		493		0
Term loans amortized, three years before		0		0
Term loans amortized, four years before		0		0
Term loans amortized, prior		1,046		1,171
Term loans amortized, revolving		1,090		927
Loans		2,629		2,591
Consumer Portfolio Segment [Member]
Term loans amortized, current year		284		1,539
Term loans amortized, one year before		1,328		1,047
Term loans amortized, two years before		896		384
Term loans amortized, three years before		290		112
Term loans amortized, four years before		89		36
Term loans amortized, prior		3,064		3,446
Term loans amortized, revolving		0		0
Loans	[1],[2]	5,951		6,564
Current-period gross charge-offs current		0		0
Current-period gross charge-offs one year before		0		0
Current-period gross charge-offs, two years before		0		2
Current-period gross charge-offs, three years before		0		6
Current-period gross charge-offs, four years before		0		0
Current-period gross charge-offs, prior		44		30
Current-period gross charge-offs, revolving		0		0
Current-period gross charge-offs, total		44	$ (0)	38
Consumer Portfolio Segment [Member] | Pass [Member]
Term loans amortized, current year		284		1,539
Term loans amortized, one year before		1,328		1,047
Term loans amortized, two years before		896		381
Term loans amortized, three years before		290		112
Term loans amortized, four years before		89		36
Term loans amortized, prior		2,904		3,284
Term loans amortized, revolving		0		0
Loans		5,791		6,399
Consumer Portfolio Segment [Member] | Substandard [Member]
Term loans amortized, current year		0		0
Term loans amortized, one year before		0		0
Term loans amortized, two years before		0		3
Term loans amortized, three years before		0		0
Term loans amortized, four years before		0		0
Term loans amortized, prior		160		162
Term loans amortized, revolving		0		0
Loans		$ 160		$ 165

[1] Accrued interest of $5.5 million and $5.5 million at March 31, 2025 and December 31, 2024, respectively, is excluded from amortized cost and presented in "accrued interest receivable and other assets" on the Consolidated Balance Sheets.

[2] Unearned income, including net deferred loan fees and costs and unamortized premiums and discounts, totaled $7.7 million and $8.2 million at March 31, 2025 and December 31, 2024, respectively.