Note 4 - Loans - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance	$ 166,538	$ 123,224	$ 122,391
Provision/(reversal) for credit losses	(11,210)	57,500	(7,000)
Loans charged off	(20,054)	(21,996)	(6,997)
Recoveries of charged off loans	2,443	7,810	14,830
Balance	136,157	166,538	123,224
Reserve for off Balance Sheet Credit Commitments [Member]
Balance	5,880	3,855	2,250
Provision/(reversal) for credit losses	(4,798)	2,025	1,605
Balance	7,100	5,880	3,855
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance	(1,560)	0	0
Balance		(1,560)	0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Reserve for off Balance Sheet Credit Commitments [Member]
Balance	$ 6,018	0	0
Balance		$ 6,018	$ 0