Note 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of ASU 2016-13 (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021	Jan. 01, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss		$ 174
Less allowance for estimated losses on loans/leases	$ 84,376	81,831		$ 84,376	$ 42,233	$ 36,001
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
Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	35,421	36,714		35,421	18,151	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 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	19,269	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)
Construction and Land Development [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		12,327
Multi-family
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		6,278
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
Direct financing leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	1,764	2,192		1,764	1,303	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)
1-4 family real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		5,165
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
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	2,313	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)
Consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	$ 1,298	1,045		$ 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)
Installment and other consumer loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases					$ 1,197	$ 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		3,547
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 - other | Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		33,167
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 | Direct financing leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		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		11,155
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
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		$ 12,327
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