Note 23 - Quarterly Financial Data (Unaudited) - Summary of Quarterly Earnings (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest income	$ 30,988	$ 29,722	$ 27,970	$ 25,639	$ 25,832	$ 25,789	$ 26,538	$ 27,151	$ 114,319	$ 105,310	$ 114,036
Interest expense	367	380	423	486	600	643	724	869	1,656	2,836	5,464
Net interest income	30,621	29,342	27,547	25,153	25,232	25,146	25,814	26,282	112,663	102,474	108,572
Provision for (recovery of) credit/loan losses	3,416	685	510	1,961	(846)	(1,394)	(2,230)	(4,001)	6,572	(8,471)	12,668
Net interest income after provision	27,205	28,657	27,037	23,192	26,078	26,540	28,044	30,283	106,091	110,945	95,904
Noninterest income, excluding net gain (loss) on sale of securities	9,184	9,950	8,854	9,194	9,215	8,720	8,797	7,569
Noninterest expense	20,730	21,145	21,255	19,986	21,701	18,836	19,361	18,820	83,116	78,718	79,625
Income before income taxes	15,659	17,462	14,636	12,400	13,592	16,424	17,480	19,032	60,157	66,528	46,112
Income tax expense	3,076	4,111	3,423	2,885	3,037	3,816	4,077	4,430	13,495	15,360	10,186
Net income	$ 12,583	$ 13,351	$ 11,213	$ 9,515	$ 10,555	$ 12,608	$ 13,403	$ 14,602	$ 46,662	$ 51,168	$ 35,926
Basic (in dollars per share)	$ 0.78	$ 0.82	$ 0.67	$ 0.57	$ 0.62	$ 0.73	$ 0.77	$ 0.83	$ 2.82	$ 2.95	$ 2.02
Diluted (in dollars per share)	0.77	0.81	0.67	0.56	0.62	0.73	0.76	0.82	2.82	2.94	2.02
Dividends per common share (in dollars per share)	$ 0.29	$ 0.29	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.25	$ 0.25	$ 1.12	$ 1.04	$ 1.00
Weighted average common shares outstanding, basic (in shares)	16,229,289	16,378,022	16,662,817	16,817,284	16,974,005	17,221,244	17,486,182	17,669,937	16,519,848	17,335,615	17,781,748
Weighted average diluted shares outstanding (in shares)	16,281,922	16,413,202	16,682,615	16,864,515	17,038,980	17,279,576	17,536,144	17,729,185	16,562,257	17,402,936	17,815,380