Note 9 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Balance	$ 155,109	$ 148,772	$ 146,485	$ 136,157	$ 136,157
(Reversal)/provision for expected credit losses	6,121	602	21,581	12,709
Charge-offs	(7,483)	(2,228)	(17,873)	(2,500)	(5,490)
Recoveries	872	1,671	4,426	2,451
Net (charge-offs)/recoveries	(6,611)	(557)	(13,447)	(49)
Balance	154,619	148,817	154,619	148,817	146,485
Commitments to Extend Credit [Member]
Balance	10,525	6,136	8,730	7,100	7,100
(Reversal)/provision for expected credit losses	879	1,398	2,674	434
Balance	11,404	7,534	11,404	7,534	8,730
Commercial Portfolio Segment [Member]
Balance	50,579	49,069	49,435	43,394	43,394
(Reversal)/provision for expected credit losses	(178)	1,845	6,276	7,258
Charge-offs	(6,254)	(2,091)	(12,517)	(2,362)	(3,222)
Recoveries	611	1,576	1,564	2,109
Net (charge-offs)/recoveries	(5,643)	(515)	(10,953)	(253)
Balance	44,758	50,399	44,758	50,399	49,435
Commercial Portfolio Segment [Member] | Commitments to Extend Credit [Member]
Balance	6,984	2,804	4,840	3,725	3,725
(Reversal)/provision for expected credit losses	1,570	1,576	3,714	655
Balance	8,554	4,380	8,554	4,380	4,840
Real Estate Construction Portfolio Segment [Member]
Balance	12,751	7,276	10,417	6,302	6,302
(Reversal)/provision for expected credit losses	2,360	(1,065)	4,694	(97)
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	6
Net (charge-offs)/recoveries	0	0	0	6
Balance	15,111	6,211	15,111	6,211	10,417
Real Estate Construction Portfolio Segment [Member] | Commitments to Extend Credit [Member]
Balance	3,541	3,306	3,890	3,375	3,375
(Reversal)/provision for expected credit losses	(691)	(152)	(1,040)	(221)
Balance	2,850	3,154	2,850	3,154	3,890
Commercial Real Estate Portfolio Segment [Member]
Balance	73,547	68,600	68,366	61,081	61,081
(Reversal)/provision for expected credit losses	3,307	1,362	10,027	8,699
Charge-offs	(1,221)	0	(5,341)	0	(2,091)
Recoveries	252	88	2,833	270
Net (charge-offs)/recoveries	(969)	88	(2,508)	270
Balance	75,885	70,050	75,885	70,050	68,366
Commercial Real Estate Portfolio Segment [Member] | Commitments to Extend Credit [Member]
Balance	0	26	0	0	0
(Reversal)/provision for expected credit losses	0	(26)	0	0
Balance	0	0	0	0	0
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Balance	18,214	23,692	18,232	25,379	25,379
(Reversal)/provision for expected credit losses	586	(1,612)	548	(3,357)
Charge-offs	0	(58)	0	(58)
Recoveries	9	7	29	65
Net (charge-offs)/recoveries	9	(51)	29	7
Balance	18,809	22,029	18,809	22,029	18,232
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Commitments to Extend Credit [Member]
Balance	0	0	0	0	0
(Reversal)/provision for expected credit losses	0	0	0	0
Balance	0	0	0	0	0
Installment and Other Loans [Member ]
Balance	18	135	35	1	1
(Reversal)/provision for expected credit losses	46	72	36	206
Charge-offs	(8)	(79)	(15)	(80)	(177)
Recoveries	0	0	0	1
Net (charge-offs)/recoveries	(8)	(79)	(15)	(79)
Balance	56	128	56	128	35
Installment and Other Loans [Member ] | Commitments to Extend Credit [Member]
Balance	0	0	0	0	0
(Reversal)/provision for expected credit losses	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0	$ 0