Note 2 - Loans and Allowance for Credit Losses - Loans by Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Originated more than five years prior	$ 290,541		$ 248,956
Originated five years prior	85,694		47,892
Originated four years prior	181,387		87,156
Originated three years prior	152,897		188,187
Originated two years prior	89,317		152,982
Originated current year	21,860		90,857
Revolving	42,348		41,032
Revolving loans converted to term	47		113
Gross loans	864,091		857,175
Originated more than five years prior, write-offs			0
Originated five years prior, write offs			15
Originated four years prior, write offs			17
Originated three years prior, write offs			20
YTD gross charge-offs			90
Originated current year, write offs			107
Revolving, write offs			229
Revolving loans converted to term, write offs			0
Loans charged against the allowance for credit losses	109	$ 92	478
Pass [Member]
Originated more than five years prior	280,407		238,797
Originated five years prior	85,694		47,892
Originated four years prior	181,107		87,156
Originated three years prior	152,890		187,901
Originated two years prior	89,302		152,964
Originated current year	21,841		90,825
Revolving	42,238		40,983
Revolving loans converted to term	47		113
Gross loans	853,526		846,631
Classified Excluding Impaired [Member]
Originated more than five years prior	3,738		3,763
Originated five years prior	0		0
Originated four years prior	280		0
Originated three years prior	7		286
Originated two years prior	0		18
Originated current year	8		15
Revolving	110		49
Revolving loans converted to term	0		0
Gross loans	4,143		4,131
Special Mention [Member]
Originated more than five years prior	6,396		6,396
Originated five years prior	0		0
Originated four years prior	0		0
Originated three years prior	0		0
Originated two years prior	15		0
Originated current year	11		17
Revolving	0		0
Revolving loans converted to term	0		0
Gross loans	6,422		6,413
Real Estate Construction Portfolio Segment[Member]
Gross loans	61,486		55,379
Loans charged against the allowance for credit losses	(0)	(0)	(0)
Real Estate Construction Portfolio Segment[Member] | Construction Residential [Member] | Pass [Member]
Originated more than five years prior	0		0
Originated five years prior	0		0
Originated four years prior	0		246
Originated three years prior	1,216		158
Originated two years prior	6,251		3,275
Originated current year	219		5,157
Revolving	3,917		4,606
Revolving loans converted to term	0		0
Gross loans	11,603		13,442
Real Estate Construction Portfolio Segment[Member] | Construction, Other [Member]
Originated more than five years prior	3,748		2,741
Originated five years prior	1,280		1,094
Originated four years prior	9,491		1,305
Originated three years prior	21,615		12,957
Originated two years prior	5,596		17,397
Originated current year	4,960		4,884
Revolving	3,193		1,559
Revolving loans converted to term	0		0
Gross loans	49,883		41,937
Real Estate Construction Portfolio Segment[Member] | Construction, Other [Member] | Pass [Member]
Originated more than five years prior	3,748		2,741
Originated five years prior	1,280		1,094
Originated four years prior	9,211		1,305
Originated three years prior	21,615		12,671
Originated two years prior	5,596		17,397
Originated current year	4,960		4,884
Revolving	3,193		1,559
Revolving loans converted to term	0		0
Gross loans	49,603		41,651
Real Estate Construction Portfolio Segment[Member] | Construction, Other [Member] | Classified Excluding Impaired [Member]
Originated more than five years prior	0		0
Originated five years prior	0		0
Originated four years prior	280		0
Originated three years prior	0		286
Originated two years prior	0		0
Originated current year	0		0
Revolving	0		0
Revolving loans converted to term	0		0
Gross loans	280		286
Real Estate Construction Portfolio Segment[Member] | Equity Lines [Member]
Originated more than five years prior	76		51
Originated five years prior	0		0
Originated four years prior	0		0
Originated three years prior	0		0
Originated two years prior	0		0
Originated current year	0		0
Revolving	17,393		17,231
Revolving loans converted to term	47		0
Gross loans	17,516		17,282
Real Estate Construction Portfolio Segment[Member] | Equity Lines [Member] | Classified Excluding Impaired [Member]
Originated more than five years prior	0		0
Originated five years prior	0		0
Originated four years prior	0		0
Originated three years prior	0		0
Originated two years prior	0		0
Originated current year	0		0
Revolving	90		49
Revolving loans converted to term	0		0
Gross loans	90		49
Consumer Real Estate Portfolio Segment [Member]
Gross loans	244,946		241,564
Loans charged against the allowance for credit losses	(0)	(0)	17
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]
Gross loans	17,516		17,282
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member] | Pass [Member]
Originated more than five years prior	76		51
Originated five years prior	0		0
Originated four years prior	0		0
Originated three years prior	0		0
Originated two years prior	0		0
Originated current year	0		0
Revolving	17,303		17,182
Revolving loans converted to term	47		0
Gross loans	17,426		17,233
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]
Originated more than five years prior	37,591		32,830
Originated five years prior	14,707		5,806
Originated four years prior	30,734		14,634
Originated three years prior	30,468		31,414
Originated two years prior	12,135		29,787
Revolving	0		0
Revolving loans converted to term	0		0
Gross loans	129,805		125,679
Originated more than five years prior, write-offs	0		0
Originated five years prior, write offs	0		0
Originated four years prior, write offs	0		17
Originated three years prior, write offs	0		0
YTD gross charge-offs	0		0
Originated current year, write offs	0		0
Revolving, write offs	22		0
Revolving loans converted to term, write offs	0		0
Loans charged against the allowance for credit losses	22		17
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member] | Pass [Member]
Originated more than five years prior	37,144		32,404
Originated five years prior	14,707		5,806
Originated four years prior	30,734		14,634
Originated three years prior	30,468		31,414
Originated two years prior	12,135		29,787
Originated current year	4,170		11,208
Revolving	0		0
Revolving loans converted to term	0		0
Gross loans	129,358		125,253
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member] | Classified Excluding Impaired [Member]
Originated more than five years prior	447		426
Originated five years prior	0		0
Originated four years prior	0		0
Originated three years prior	0		0
Originated two years prior	0		0
Originated current year	0		0
Revolving	0		0
Revolving loans converted to term	0		0
Gross loans	447		426
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]
Gross loans	4,943		5,039
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member] | Pass [Member]
Originated more than five years prior	1,602		1,499
Originated five years prior	0		116
Originated four years prior	169		0
Originated three years prior	1,379		172
Originated two years prior	1,343		1,387
Originated current year	450		1,850
Revolving	0		0
Revolving loans converted to term	0		15
Gross loans	4,943		5,039
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Originated more than five years prior	29,664		25,264
Originated five years prior	23,228		5,162
Originated four years prior	18,699		23,649
Originated three years prior	13,248		19,062
Originated two years prior	4,586		14,166
Originated current year	1,323		4,880
Revolving	1,934		1,283
Revolving loans converted to term	0		98
Gross loans	92,682		93,564
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member] | Pass [Member]
Originated more than five years prior	28,964		24,556
Originated five years prior	23,228		5,162
Originated four years prior	18,699		23,649
Originated three years prior	13,248		19,062
Originated two years prior	4,586		14,166
Originated current year	1,323		4,880
Revolving	1,934		1,283
Revolving loans converted to term	0		98
Gross loans	91,982		92,856
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member] | Classified Excluding Impaired [Member]
Originated more than five years prior	700		708
Originated five years prior	0		0
Originated four years prior	0		0
Originated three years prior	0		0
Originated two years prior	0		0
Originated current year	0		0
Revolving	0		0
Revolving loans converted to term	0		0
Gross loans	700		708
Commercial Real Estate Portfolio Segment [Member]
Gross loans	414,615		419,130
Loans charged against the allowance for credit losses	(0)	(0)	(0)
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]
Gross loans	118,309		119,247
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member] | Pass [Member]
Originated more than five years prior	41,102		40,092
Originated five years prior	2,130		1,806
Originated four years prior	40,354		2,148
Originated three years prior	25,647		40,544
Originated two years prior	8,894		25,681
Originated current year	62		8,850
Revolving	120		126
Revolving loans converted to term	0		0
Gross loans	118,309		119,247
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Originated more than five years prior	60,048		50,378
Originated five years prior	23,144		11,091
Originated four years prior	4,425		23,407
Originated three years prior	16,640		4,792
Originated two years prior	8,027		16,720
Originated current year	120		7,914
Revolving	2,426		2,919
Revolving loans converted to term	0		0
Gross loans	114,830		117,221
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Pass [Member]
Originated more than five years prior	51,271		41,573
Originated five years prior	23,144		11,091
Originated four years prior	4,425		23,407
Originated three years prior	16,640		4,792
Originated two years prior	8,027		16,720
Originated current year	120		7,914
Revolving	2,426		2,919
Revolving loans converted to term	0		0
Gross loans	106,053		108,416
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Classified Excluding Impaired [Member]
Originated more than five years prior	2,381		2,409
Originated five years prior	0		0
Originated four years prior	0		0
Originated three years prior	0		0
Originated two years prior	0		0
Originated current year	0		0
Revolving	0		0
Revolving loans converted to term	0		0
Gross loans	2,381		2,409
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member] | Special Mention [Member]
Originated more than five years prior	6,396		6,396
Originated five years prior	0		0
Originated four years prior	0		0
Originated three years prior	0		0
Originated two years prior	0		0
Originated current year	0		0
Revolving	0		0
Revolving loans converted to term	0		0
Gross loans	6,396		6,396
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Gross loans	181,476		182,662
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member] | Pass [Member]
Originated more than five years prior	89,181		68,889
Originated five years prior	18,902		21,841
Originated four years prior	35,780		19,098
Originated three years prior	22,476		36,157
Originated two years prior	13,216		22,697
Originated current year	1,215		13,279
Revolving	706		701
Revolving loans converted to term	0		0
Gross loans	181,476		182,662
Commercial Non Real Estate Segment [Member]
Gross loans	41,835		41,555
Loans charged against the allowance for credit losses	(0)	12	214
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Originated more than five years prior	6,548		6,224
Originated five years prior	944		438
Originated four years prior	12,299		1,060
Originated three years prior	6,482		12,667
Originated two years prior	6,164		6,961
Originated current year	2,139		6,938
Revolving	7,259		7,267
Revolving loans converted to term	0		0
Gross loans	41,835		41,555
Originated more than five years prior, write-offs	0		0
Originated five years prior, write offs	4		12
Originated four years prior, write offs	0		0
Originated three years prior, write offs	13		0
YTD gross charge-offs	46		0
Originated current year, write offs	24		12
Revolving, write offs	0		190
Revolving loans converted to term, write offs	0		0
Loans charged against the allowance for credit losses	87		214
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member] | Pass [Member]
Originated more than five years prior	6,338		6,004
Originated five years prior	944		438
Originated four years prior	12,299		1,060
Originated three years prior	6,475		12,667
Originated two years prior	6,164		6,954
Originated current year	2,139		6,938
Revolving	7,239		7,267
Revolving loans converted to term	0		0
Gross loans	41,598		41,328
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member] | Classified Excluding Impaired [Member]
Originated more than five years prior	210		220
Originated five years prior	0		0
Originated four years prior	0		0
Originated three years prior	7		0
Originated two years prior	0		7
Originated current year	0		0
Revolving	20		0
Revolving loans converted to term	0		0
Gross loans	237		227
Public Sector and IDA Portfolio Segment[Member]
Gross loans	59,742		60,551
Loans charged against the allowance for credit losses	(0)	(0)	(0)
Public Sector and IDA Portfolio Segment[Member] | Pass [Member]
Originated more than five years prior	20,432		20,817
Originated five years prior	231		0
Originated four years prior	26,375		235
Originated three years prior	6,242		26,702
Originated two years prior	6,462		6,335
Originated current year	0		6,462
Revolving	0		0
Revolving loans converted to term	0		0
Gross loans	59,742		60,551
Consumer Non Real Estate Portfolio Segment [Member]
Gross loans	41,467		38,996
Loans charged against the allowance for credit losses	109	$ 80	247
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]
Gross loans	4,666		4,668
Originated more than five years prior, write-offs	0		0
Originated five years prior, write offs	4		0
Originated four years prior, write offs	0		0
Originated three years prior, write offs	13		0
YTD gross charge-offs	46		0
Originated current year, write offs	24		0
Revolving, write offs	22		39
Revolving loans converted to term, write offs	0		0
Loans charged against the allowance for credit losses	109		39
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member] | Pass [Member]
Originated more than five years prior	0		0
Originated five years prior	0		0
Originated four years prior	0		0
Originated three years prior	0		0
Originated two years prior	0		0
Originated current year	0		0
Revolving	4,666		4,668
Revolving loans converted to term	0		0
Gross loans	4,666		4,668
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Gross loans	12,921		12,261
Originated more than five years prior, write-offs			0
Originated five years prior, write offs			3
Originated four years prior, write offs			0
Originated three years prior, write offs			1
YTD gross charge-offs			38
Originated current year, write offs			0
Revolving, write offs			0
Revolving loans converted to term, write offs			0
Loans charged against the allowance for credit losses			42
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member] | Pass [Member]
Originated more than five years prior	182		78
Originated five years prior	437		204
Originated four years prior	1,388		563
Originated three years prior	2,375		1,619
Originated two years prior	6,448		2,750
Originated current year	2,091		7,047
Revolving	0		0
Revolving loans converted to term	0		0
Gross loans	12,921		12,261
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]
Originated more than five years prior	367		93
Originated five years prior	691		334
Originated four years prior	1,673		811
Originated three years prior	5,109		1,943
Originated two years prior	10,195		5,826
Originated current year	5,111		12,388
Revolving	734		672
Revolving loans converted to term	0		0
Gross loans	23,880		22,067
Originated more than five years prior, write-offs			0
Originated five years prior, write offs			0
Originated four years prior, write offs			0
Originated three years prior, write offs			19
YTD gross charge-offs			52
Originated current year, write offs			95
Revolving, write offs			0
Revolving loans converted to term, write offs			0
Loans charged against the allowance for credit losses			166
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member] | Pass [Member]
Originated more than five years prior	367		93
Originated five years prior	691		334
Originated four years prior	1,673		811
Originated three years prior	5,109		1,943
Originated two years prior	10,180		5,815
Originated current year	5,092		12,356
Revolving	734		672
Revolving loans converted to term	0		0
Gross loans	23,846		22,024
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member] | Classified Excluding Impaired [Member]
Originated more than five years prior	0		0
Originated five years prior	0		0
Originated four years prior	0		0
Originated three years prior	0		0
Originated two years prior	0		11
Originated current year	8		15
Revolving	0		0
Revolving loans converted to term	0		0
Gross loans	8		26
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member] | Special Mention [Member]
Originated more than five years prior	0		0
Originated five years prior	0		0
Originated four years prior	0		0
Originated three years prior	0		0
Originated two years prior	15		0
Originated current year	11		17
Revolving	0		0
Revolving loans converted to term	0		0
Gross loans	$ 26		$ 17