Note 5 - Goodwill and Core Deposit Intangibles - Changes in the Net Carrying Amount of Core Deposit Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Balance at beginning of period			$ 1,962
Balance at end of period	$ 5,871		5,871
Core Deposits [Member]
Balance at beginning of period	5,162	$ 2,122	1,962	$ 2,285
Core deposit intangible acquired	0	0	3,404	0
Recast adjustment	999	0	999	0
Amortization	(290)	(80)	(494)	(243)
Balance at end of period	$ 5,871	$ 2,042	$ 5,871	$ 2,042