Note 6 - Goodwill and Intangibles - Core Deposit Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance at the beginning of period	$ 11,381	$ 14,970
Amortization expense	(2,032)	(2,149)	$ (2,266)
Balance at the end of the period	9,349	11,381	14,970
Net book value	9,349	11,381	14,970
Core Deposits [Member]
Balance at the beginning of period	11,381	13,466	15,595
Amortization expense	(2,032)	(2,085)	(2,129)
Balance at the end of the period	9,349	11,381	13,466
Gross carrying amount	19,255	19,255	19,255
Accumulated amortization	(9,906)	(7,874)	(5,789)
Net book value	$ 9,349	$ 11,381	$ 13,466