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, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Balance				$ 78,773				$ 79,226	$ 78,773	$ 79,226
Charge-offs									(5,443)	(2,397)	$ (900)
Recoveries									117	405	833
Provision for credit losses	$ 3,300	$ 10,000	$ 3,000	1,450	$ 815	$ 1,100	$ (1,649)	(5,766)	17,066	(5,018)	41,000
Balance	90,513				78,773				90,513	78,773	79,226
Balance				78,773				79,226	78,773	79,226	38,293
Balance	90,513				78,773				90,513	78,773	79,226
Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance								6,557		6,557
Balance											6,557
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance								85,783		85,783
Balance											85,783
Commercial Portfolio Segment [Member]
Balance				25,969				28,443	25,969	28,443
Charge-offs									(2,612)	(382)	(552)
Recoveries									54	289	4
Provision for credit losses									5,492	1,844	20,642
Balance	28,903				25,969				28,903	25,969	28,443
Balance				25,969				28,443	25,969	28,443	8,349
Balance	28,903				25,969				28,903	25,969	28,443
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance								(4,225)		(4,225)
Balance											(4,225)
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance								24,218		24,218
Balance											24,218
Commercial Real Estate Portfolio Segment [Member]
Balance				45,589				39,330	45,589	39,330
Charge-offs									(2,819)	(1,780)	0
Recoveries									0	85	802
Provision for credit losses									10,972	(1,651)	17,675
Balance	53,742				45,589				53,742	45,589	39,330
Balance				45,589				39,330	45,589	39,330	20,853
Balance	53,742				45,589				53,742	45,589	39,330
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance								9,605		9,605
Balance											9,605
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance								48,935		48,935
Balance											48,935
Commercial Construction Portfolio Segment [Member]
Balance				3,580				8,194	3,580	8,194
Charge-offs									0	0	0
Recoveries									0	0	0
Provision for credit losses									138	(3,653)	890
Balance	3,718				3,580				3,718	3,580	8,194
Balance				3,580				8,194	3,580	8,194	7,304
Balance	3,718				3,580				3,718	3,580	8,194
Commercial Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance								(961)		(961)
Balance											(961)
Commercial Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance								7,233		7,233
Balance											7,233
Residential Portfolio Segment [Member]
Balance				3,628				2,687	3,628	2,687
Charge-offs									(9)	(235)	(341)
Recoveries									63	20	23
Provision for credit losses									461	(1,541)	1,320
Balance	4,143				3,628				4,143	3,628	2,687
Balance				3,628				2,687	3,628	2,687	1,685
Balance	4,143				3,628				4,143	3,628	2,687
Residential Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance								2,697		2,697
Balance											2,697
Residential Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance								5,384		5,384
Balance											5,384
Consumer Portfolio Segment [Member]
Balance				7				4	7	4
Charge-offs									(3)	0	(7)
Recoveries									0	11	4
Provision for credit losses									3	(17)	4
Balance	7				7				7	7	4
Balance				7				4	7	4	3
Balance	7				7				7	7	4
Consumer Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance								9		9
Balance											9
Consumer Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance								13		13
Balance											13
Unallocated Financing Receivables [Member]
Balance				0				568	0	568
Charge-offs									0	0	0
Recoveries									0	0	0
Provision for credit losses									0	0	469
Balance	$ 0				0				0	0	568
Balance				$ 0				568	$ 0	568	99
Balance					$ 0					0	568
Unallocated Financing Receivables [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance								(568)		(568)
Balance											(568)
Unallocated Financing Receivables [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance								$ 0		$ 0
Balance											$ 0