Note 19 - Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net income	$ 4,149	$ 3,424	$ 3,869	$ 5,050	$ 4,151	$ 3,778	$ 3,934	$ 220	$ 16,492	$ 12,083	$ 12,357
Adjustments to reconcile net income to net cash provided by operating activities:
Net unrealized (gain) loss on investment equity securities									(926)	47	(770)
Stock-based compensation expense									102	112	118
Accretion of discounts on investment securities									3,152	2,473	1,501
Increase (decrease) in other liabilities									703	(1,531)	(44)
Decrease in other assets									(507)	525	423
Deferred income tax provision (benefit)									113	(59)	319
Net cash provided by operating activities									30,389	7,601	13,898
Investing activities
Purchase of investment equity securities									(4,615)	(7,914)	(9,030)
Purchase of investment securities available-for-sale									(385,926)	(295,734)	(113,688)
Proceeds from sale of investment equity securities									7,768	4,767	11,838
Proceeds from sale of investment securities available-for-sale									282	6,930	47,851
Net cash used in investing activities									(282,490)	(185,133)	(33,574)
Financing activities
Cash dividend paid									(4,375)	(4,226)	(4,086)
Treasury stock purchase									(1,356)	(130)
Proceeds from issuance of common stock									575	497	591
Net cash provided by financing activities									226,160	199,255	23,826
(Decrease) increase in cash and cash equivalents									(25,941)	21,723	4,150
Cash and cash equivalents at beginning of year				39,331				17,608	39,331	17,608	13,458
Cash and cash equivalents at end of period	13,390				39,331				13,390	39,331	17,608
Parent Company [Member]
Operating Activities
Net income									16,492	12,083	12,357
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed income from subsidiary									(8,874)	(7,340)	(6,828)
Net securities gains									(1,788)	(585)	(1,781)
Net unrealized (gain) loss on investment equity securities									(926)	47	(770)
Stock-based compensation expense									102	112	118
Accretion of discounts on investment securities											(45)
Increase (decrease) in other liabilities									222	(682)	762
Decrease in other assets									2	17	126
Deferred income tax provision (benefit)									265	(20)	247
Net cash provided by operating activities									5,495	3,632	4,186
Investing activities
Purchase of investment equity securities									(4,615)	(7,914)	(9,030)
Purchase of investment securities available-for-sale											(8,730)
Proceeds from sale of investment equity securities									7,768	4,767	11,838
Proceeds from sale of investment securities available-for-sale											8,775
Capital contribution to Bank									(2,500)
Net cash used in investing activities									653	(3,147)	2,853
Financing activities
Cash dividend paid									(4,375)	(4,226)	(4,086)
Treasury stock purchase									(1,356)	(130)
Proceeds from issuance of common stock									575	497	591
Net cash provided by financing activities									(5,156)	(3,859)	(3,495)
(Decrease) increase in cash and cash equivalents									992	(3,374)	3,544
Cash and cash equivalents at beginning of year				$ 242				$ 3,616	242	3,616	72
Cash and cash equivalents at end of period	$ 1,234				$ 242				$ 1,234	$ 242	$ 3,616