Note 8 - Loans Receivable, Net - Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Current year	$ 27,483		$ 130,116
One year before	135,471		150,177
Two years before	145,563		101,397
Pass	98,402		45,028
Pass	44,151		40,368
Pass	141,106		104,966
Pass	66,956		62,444
Pass	659,132		634,496
Current year, writen off	0		0
One year before gross write-offs	6		23
Two years before gross write-offs	0		33
Three years before gross write-offs	4		17
Four years before gross write-offs	6		0
Prior gross write-offs	4		12
Revolving gross write-offs	42		90
Total loans gross write-offs	62	$ 51	175
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Current year	15,103		36,027
One year before	40,510		35,845
Two years before	29,894		16,956
Pass	16,171		4,799
Pass	1,643		3,438
Pass	5,715		2,204
Pass	5,733		5,239
Pass	114,769		104,508
Current year, writen off	0		0
One year before gross write-offs	0		0
Two years before gross write-offs	0		0
Three years before gross write-offs	0		0
Four years before gross write-offs	0		0
Prior gross write-offs	0		1
Revolving gross write-offs	0		0
Total loans gross write-offs	0	(0)	1
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Current year	13,423		31,811
One year before	36,314		21,125
Two years before	17,113		15,431
Pass	15,269		1,518
Pass	1,476		617
Pass	1,946		1,322
Pass	5,413		5,089
Pass	90,954		76,913
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Caution [Member]
Current year	1,644		4,073
One year before	4,053		14,381
Two years before	12,753		1,192
Pass	571		3,148
Pass	38		275
Pass	662		333
Pass	316		150
Pass	20,037		23,552
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Current year	36		0
One year before	0		29
Two years before	28		0
Pass	0		0
Pass	0		1,072
Pass	1,555		457
Pass	0		0
Pass	1,619		1,558
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Current year	0		143
One year before	143		310
Two years before	0		333
Pass	331		133
Pass	129		1,474
Pass	1,552		92
Pass	4		0
Pass	2,159		2,485
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member]
Current year	6,861		46,267
One year before	47,885		46,981
Two years before	51,566		19,292
Pass	18,637		16,055
Pass	18,950		5,585
Pass	33,452		28,846
Pass	9,795		9,857
Pass	187,146		172,883
Current year, writen off	0		0
One year before gross write-offs	0		0
Two years before gross write-offs	0		0
Three years before gross write-offs	0		0
Four years before gross write-offs	0		0
Prior gross write-offs	0		0
Revolving gross write-offs	0		0
Total loans gross write-offs	0	(0)	0
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Pass [Member]
Current year	4,783		28,352
One year before	29,442		36,426
Two years before	40,601		12,290
Pass	11,319		14,164
Pass	14,015		3,991
Pass	25,737		22,239
Pass	9,651		9,708
Pass	135,548		127,170
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Caution [Member]
Current year	1,861		15,050
One year before	15,588		10,397
Two years before	10,808		5,954
Pass	6,277		1,497
Pass	4,547		1,546
Pass	5,473		4,134
Pass	144		149
Pass	44,698		38,727
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Special Mention [Member]
Current year	217		2,291
One year before	2,283		158
Two years before	157		430
Pass	426		394
Pass	388		0
Pass	227		190
Pass	0		0
Pass	3,698		3,463
Commercial Real Estate Portfolio Segment [Member] | Residential Mortgage [Member] | Substandard [Member]
Current year	0		574
One year before	572		0
Two years before	0		618
Pass	615		0
Pass	0		48
Pass	2,015		2,283
Pass	0		0
Pass	3,202		3,523
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member]
Current year	1,199		29,866
One year before	31,104		54,199
Two years before	52,934		54,098
Pass	56,866		22,198
Pass	21,894		30,637
Pass	99,301		71,309
Pass	4,287		2,495
Pass	267,585		264,802
Current year, writen off	0		0
One year before gross write-offs	0		0
Two years before gross write-offs	0		0
Three years before gross write-offs	0		0
Four years before gross write-offs	0		0
Prior gross write-offs	0		0
Revolving gross write-offs	0		0
Total loans gross write-offs	0	(0)	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Pass [Member]
Current year	847		12,702
One year before	18,720		48,077
Two years before	47,539		49,377
Pass	51,776		16,593
Pass	16,349		17,806
Pass	68,756		52,848
Pass	4,119		2,375
Pass	208,106		199,778
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Caution [Member]
Current year	352		16,951
One year before	12,173		4,880
Two years before	4,161		4,212
Pass	4,587		5,197
Pass	5,139		12,831
Pass	20,741		8,468
Pass	168		20
Pass	47,321		52,559
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Current year	0		213
One year before	211		900
Two years before	895		452
Pass	448		408
Pass	406		0
Pass	5,415		5,485
Pass	0		100
Pass	7,375		7,558
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] | Substandard [Member]
Current year	0		0
One year before	0		342
Two years before	339		57
Pass	55		0
Pass	0		0
Pass	4,389		4,508
Pass	0		0
Pass	4,783		4,907
Commercial and Agricultural Loans [Member]
Current year	1,612		8,953
One year before	8,533		7,144
Two years before	5,809		8,487
Pass	4,519		720
Pass	621		371
Pass	2,285		2,487
Pass	5,540		5,124
Pass	28,919		33,286
Current year, writen off	0		0
One year before gross write-offs	0		0
Two years before gross write-offs	0		16
Three years before gross write-offs	0		0
Four years before gross write-offs	0		0
Prior gross write-offs	0		0
Revolving gross write-offs	21		0
Total loans gross write-offs	21	16	16
Commercial and Agricultural Loans [Member] | Pass [Member]
Current year	1,190		4,763
One year before	4,471		5,991
Two years before	4,510		6,672
Pass	2,759		643
Pass	590		348
Pass	1,946		2,128
Pass	4,616		4,205
Pass	20,082		24,750
Commercial and Agricultural Loans [Member] | Caution [Member]
Current year	422		3,732
One year before	3,606		1,131
Two years before	1,285		1,715
Pass	1,656		67
Pass	29		16
Pass	190		207
Pass	718		816
Pass	7,906		7,684
Commercial and Agricultural Loans [Member] | Special Mention [Member]
Current year	0		458
One year before	445		22
Two years before	14		100
Pass	23		9
Pass	2		7
Pass	90		90
Pass	100		0
Pass	674		686
Commercial and Agricultural Loans [Member] | Substandard [Member]
Current year	0		0
One year before	11		0
Two years before	0		0
Pass	81		1
Pass	0		0
Pass	59		62
Pass	106		103
Pass	257		166
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Current year	0		0
One year before	0		0
Two years before	0		0
Pass	0		0
Pass	0		0
Pass	0		0
Pass	36,201		34,497
Pass	36,201		34,497
Current year, writen off	0		0
One year before gross write-offs	0		0
Two years before gross write-offs	0		0
Three years before gross write-offs	0		0
Four years before gross write-offs	0		0
Prior gross write-offs	0		0
Revolving gross write-offs	0		1
Total loans gross write-offs	0	(0)	1
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Pass [Member]
Current year	0		0
One year before	0		0
Two years before	0		0
Pass	0		0
Pass	0		0
Pass	0		0
Pass	29,581		27,192
Pass	29,581		27,192
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Caution [Member]
Current year	0		0
One year before	0		0
Two years before	0		0
Pass	0		0
Pass	0		0
Pass	0		0
Pass	5,695		6,290
Pass	5,695		6,290
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Special Mention [Member]
Current year	0		0
One year before	0		0
Two years before	0		0
Pass	0		0
Pass	0		0
Pass	0		0
Pass	351		401
Pass	351		401
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Substandard [Member]
Current year	0		0
One year before	0		0
Two years before	0		0
Pass	0		0
Pass	0		0
Pass	0		0
Pass	574		614
Pass	574		614
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Current year	2,708		9,003
One year before	7,439		6,008
Two years before	5,360		2,564
Pass	2,209		1,256
Pass	1,043		337
Pass	353		120
Pass	5,400		5,232
Pass	24,512		24,520
Current year, writen off	0		0
One year before gross write-offs	6		23
Two years before gross write-offs	0		17
Three years before gross write-offs	4		17
Four years before gross write-offs	6		0
Prior gross write-offs	4		11
Revolving gross write-offs	21		89
Total loans gross write-offs	41	$ 35	157
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Pass [Member]
Current year	2,107		6,543
One year before	5,158		3,874
Two years before	3,459		1,580
Pass	1,339		740
Pass	611		190
Pass	179		63
Pass	5,115		4,922
Pass	17,968		17,912
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Caution [Member]
Current year	572		2,316
One year before	2,135		1,975
Two years before	1,753		911
Pass	791		468
Pass	395		137
Pass	166		51
Pass	269		295
Pass	6,081		6,153
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Special Mention [Member]
Current year	29		77
One year before	72		123
Two years before	116		0
Pass	0		0
Pass	0		0
Pass	0		0
Pass	5		6
Pass	222		206
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Substandard [Member]
Current year	0		67
One year before	74		36
Two years before	32		73
Pass	79		48
Pass	37		10
Pass	8		6
Pass	11		9
Pass	$ 241		$ 249