Note 1 - Nature of Business and Significant Accounting Policies - Impact of ASU 2016-13 (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 180	$ 198
Less allowance for estimated losses on loans/leases	87,706	78,721	$ 84,376	$ 84,376	$ 36,001
Retained earnings	450,114	386,077
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss			183
Less allowance for estimated losses on loans/leases			76,274
Off-Balance Sheet, Credit Loss, Liability			9,117
Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss			183
Less allowance for estimated losses on loans/leases			(8,102)
Off-Balance Sheet, Credit Loss, Liability			9,117
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss		183
Less allowance for estimated losses on loans/leases		(8,102)
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss			183
Less allowance for estimated losses on loans/leases			8,100
Off-Balance Sheet, Credit Loss, Liability			9,100
Retained earnings			937
Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			35,421	35,421	16,072
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			(35,421)
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		(35,421)
Commercial Real Estate Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			42,161	42,161	15,379
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			(42,161)
Commercial Real Estate Portfolio Segment [Member] | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		(42,161)
Construction and Land Development [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	14,262
Multi-family
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	13,186	9,339
Multi-family | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			5,836
Multi-family | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			5,836
Multi-family | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		5,836
Direct financing leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	970	1,546	1,764	1,764	1,464
Direct financing leases | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			(1,764)
Direct financing leases | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		(1,764)
1-4 family real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	4,963	4,541
1-4 family real estate | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			5,042
1-4 family real estate | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			5,042
1-4 family real estate | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		5,042
Residential real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			3,732	3,732	1,948
Residential real estate | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			(3,732)
Residential real estate | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		(3,732)
Consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	1,371	930	1,298	1,298
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			1,161
Consumer | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			(137)
Consumer | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		(137)
Installment and other consumer loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases				1,298	$ 1,138
C&I - revolving | Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	4,457	3,907
C&I - revolving | Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			2,982
C&I - revolving | Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			2,982
C&I - revolving | Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		2,982
C&I - other | Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	27,753	25,982
C&I - other | Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			29,130
C&I - other | Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			29,130
C&I - other | Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		29,130
C&I - other | Direct financing leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	1,500			1,800
C&I - other | Direct financing leases | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		1,500		$ 685
CRE - owner occupied | Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			8,696
CRE - owner occupied | Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			8,696
CRE - non owner occupied | Commercial Real Estate Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	11,749	8,549
CRE - non owner occupied | Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			11,428
CRE - non owner occupied | Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			11,428
CRE - non owner occupied | Commercial Real Estate Portfolio Segment [Member] | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		11,428
Construction Loans [Member] | Construction and Land Development [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	$ 14,262	16,972
Construction Loans [Member] | Construction and Land Development [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			11,999
Construction Loans [Member] | Construction and Land Development [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			$ 11,999
Construction Loans [Member] | Construction and Land Development [Member] | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		$ 11,999