Note 4 - Loans and Allowance for Credit Losses - Loans by Credit Grade (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Pass	$ 93,782		$ 93,782		$ 105,230
Pass	94,386		94,386		45,778
Pass	42,734		42,734		94,987
Pass	91,348		91,348		67,785
Pass	60,889		60,889		28,214
Pass	204,640		204,640		213,360
Pass	39,985		39,985		32,608
Loans	627,764		627,764		587,962
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			646		162
Charge-offs			0		0
Charge-offs	290	$ (0)	646	$ 156	162
Pass [Member]
Pass	89,070		89,070		100,556
Pass	81,513		81,513		45,776
Pass	42,734		42,734		94,987
Pass	85,434		85,434		67,784
Pass	60,889		60,889		28,214
Pass	198,733		198,733		202,093
Pass	33,513		33,513		32,584
Loans	591,886		591,886		571,994
Special Mention [Member]
Pass	4,363		4,363		4,674
Pass	12,873		12,873		0
Pass	0		0		0
Pass	5,914		5,914		0
Pass	0		0		0
Pass	6,027		6,027		0
Pass	6,027		6,027		0
Loans	29,177		29,177		4,674
Substandard [Member]
Pass	349		349		0
Pass	0		0		2
Pass	0		0		0
Pass	0		0		1
Pass	0		0		0
Pass	445		445		11,267
Pass	445		445		24
Loans	6,701		6,701		11,294
Doubtful [Member]
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Loans	0		0		0
Commercial Real Estate Portfolio Segment [Member]
Pass	65,626		65,626		63,427
Pass	59,333		59,333		26,745
Pass	26,582		26,582		69,261
Pass	65,397		65,397		54,346
Pass	53,005		53,005		19,727
Pass	154,674		154,674		161,061
Pass	5,901		5,901		3,559
Loans	430,518		430,518		398,126
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			646		0
Charge-offs			0		0
Charge-offs			646	0	0
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Pass	63,805		63,805		63,427
Pass	46,571		46,571		26,745
Pass	26,582		26,582		69,261
Pass	59,483		59,483		54,346
Pass	53,005		53,005		19,727
Pass	150,047		150,047		151,876
Pass	5,501		5,501		3,559
Loans	404,274		404,274		388,941
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Pass	2,200		2,200		0
Pass	12,762		12,762		0
Pass	0		0		0
Pass	5,914		5,914		0
Pass	0		0		0
Pass	0		0		0
Pass	400		400		0
Loans	21,276		21,276		0
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Pass	341		341		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	4,627		4,627		9,185
Pass	0		0		0
Loans	4,968		4,968		9,185
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Loans	0		0		0
Construction and Land Development [Member]
Pass	7,909		7,909		14,710
Pass	13,949		13,949		3,365
Pass	2,651		2,651		1,568
Pass	3,888		3,888		1,443
Pass	152		152		930
Pass	5,668		5,668		5,341
Pass					0
Loans	34,217		34,217		27,357
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0	0	0
Construction and Land Development [Member] | Pass [Member]
Pass	7,909		7,909		14,710
Pass	13,949		13,949		3,365
Pass	2,651		2,651		1,568
Pass	3,888		3,888		1,443
Pass	152		152		930
Pass	5,668		5,668		5,341
Pass	0		0		0
Loans	34,217		34,217		27,357
Construction and Land Development [Member] | Special Mention [Member]
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Loans	0		0		0
Construction and Land Development [Member] | Substandard [Member]
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Loans	0		0		0
Construction and Land Development [Member] | Doubtful [Member]
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Loans	0		0		0
Residential Portfolio Segment [Member]
Pass	13,237		13,237		12,385
Pass	10,433		10,433		10,592
Pass	10,014		10,014		18,474
Pass	17,493		17,493		9,363
Pass	5,661		5,661		7,084
Pass	43,583		43,583		45,991
Pass	10,611		10,611		8,009
Loans	111,032		111,032		111,898
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		5
Charge-offs			0		0
Charge-offs			0	0	5
Residential Portfolio Segment [Member] | Pass [Member]
Pass	13,237		13,237		12,385
Pass	10,433		10,433		10,592
Pass	10,014		10,014		18,474
Pass	17,493		17,493		9,363
Pass	5,661		5,661		7,084
Pass	42,303		42,303		44,409
Pass	10,591		10,591		7,985
Loans	109,732		109,732		110,292
Residential Portfolio Segment [Member] | Special Mention [Member]
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Loans	0		0		0
Residential Portfolio Segment [Member] | Substandard [Member]
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	1,280		1,280		1,582
Pass	20		20		24
Loans	1,300		1,300		1,606
Residential Portfolio Segment [Member] | Doubtful [Member]
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Loans	0		0		0
Commercial Portfolio Segment [Member]
Pass	6,978		6,978		14,602
Pass	10,612		10,612		5,017
Pass	3,447		3,447		5,675
Pass	4,570		4,570		2,632
Pass	2,071		2,071		472
Pass	713		713		967
Pass	23,473		23,473		21,040
Loans	51,864		51,864		50,405
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		152
Charge-offs			0		0
Charge-offs			0	153	152
Commercial Portfolio Segment [Member] | Pass [Member]
Pass	4,807		4,807		9,928
Pass	10,501		10,501		5,017
Pass	3,447		3,447		5,675
Pass	4,570		4,570		2,632
Pass	2,071		2,071		472
Pass	713		713		467
Pass	17,421		17,421		21,040
Loans	43,530		43,530		45,231
Commercial Portfolio Segment [Member] | Special Mention [Member]
Pass	2,163		2,163		4,674
Pass	111		111		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	5,627		5,627		0
Loans	7,901		7,901		4,674
Commercial Portfolio Segment [Member] | Substandard [Member]
Pass	8		8		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		500
Pass	425		425		0
Loans	433		433		500
Commercial Portfolio Segment [Member] | Doubtful [Member]
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Loans	0		0		0
Consumer Portfolio Segment [Member]
Pass	32		32		106
Pass	59		59		59
Pass	40		40		9
Pass	0		0		1
Pass	0		0		1
Pass	2		2		0
Pass	0		0		0
Loans	133		133		176
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		0
Charge-offs			0		5
Charge-offs			0		0
Charge-offs			0	$ 3	5
Consumer Portfolio Segment [Member] | Pass [Member]
Pass	32		32		106
Pass	59		59		57
Pass	40		40		9
Pass	0		0		0
Pass	0		0		1
Pass	2		2		0
Pass	0		0		0
Loans	133		133		173
Consumer Portfolio Segment [Member] | Special Mention [Member]
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Loans	0		0		0
Consumer Portfolio Segment [Member] | Substandard [Member]
Pass	0		0		0
Pass	0		0		2
Pass	0		0		0
Pass	0		0		1
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Loans	0		0		3
Consumer Portfolio Segment [Member] | Doubtful [Member]
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Pass	0		0		0
Loans	$ 0		$ 0		$ 0