Note 4 - Loans and the Allowance for Credit Losses - Activity in the ACL for Loans (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance				$ 90,513				$ 78,773	$ 90,513	$ 78,773	$ 79,226
Charge-offs									(17,049)	(5,443)	(2,397)
Recoveries									86	117	405
Provision for (reversal) of credit losses	$ 2,700	$ 1,500	$ 3,000	1,000	$ 3,300	$ 10,000	$ 3,000	1,450	8,424	17,066	(5,018)
Balance	81,974				90,513				81,974	90,513	78,773
Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance											6,557
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance											85,783
Commercial Portfolio Segment [Member]
Balance				28,903				25,969	28,903	25,969	28,443
Charge-offs									(14,888)	(2,612)	(382)
Recoveries									10	54	289
Provision for (reversal) of credit losses									6,607	5,492	1,844
Balance	20,632				28,903				20,632	28,903	25,969
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance											(4,225)
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance											24,218
Commercial Real Estate Portfolio Segment [Member]
Balance				53,742				45,589	53,742	45,589	39,330
Charge-offs									(2,142)	(2,819)	(1,780)
Recoveries									0	0	85
Provision for (reversal) of credit losses									678	10,972	(1,651)
Balance	52,278				53,742				52,278	53,742	45,589
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance											9,605
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance											48,935
Commercial Construction Portfolio Segment [Member]
Balance				3,718				3,580	3,718	3,580	8,194
Charge-offs									0	0	0
Recoveries									0	0	0
Provision for (reversal) of credit losses									1,021	138	(3,653)
Balance	4,739				3,718				4,739	3,718	3,580
Commercial Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance											(961)
Commercial Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance											7,233
Residential Portfolio Segment [Member]
Balance				4,143				3,628	4,143	3,628	2,687
Charge-offs									(18)	(9)	(235)
Recoveries									68	63	20
Provision for (reversal) of credit losses									127	461	(1,541)
Balance	4,320				4,143				4,320	4,143	3,628
Residential Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance											2,697
Residential Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance											5,384
Consumer Portfolio Segment [Member]
Balance				$ 7				7	7	7	4
Charge-offs									(1)	(3)	0
Recoveries									8	0	11
Provision for (reversal) of credit losses									(9)	3	(17)
Balance	$ 5				$ 7				$ 5	7	7
Consumer Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance											9
Consumer Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance											13
Unallocated Financing Receivables [Member]
Balance								$ 0		$ 0	568
Charge-offs											0
Recoveries											0
Provision for (reversal) of credit losses											0
Balance											0
Unallocated Financing Receivables [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance											(568)
Unallocated Financing Receivables [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance											$ 0