Note 19 - Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income	$ 2,745	$ 3,090	$ 3,143	$ 3,379	$ 2,327	$ 3,211	$ 2,862	$ 2,935	$ 12,357	$ 11,335	$ 8,289
Adjustments to reconcile net income to net cash provided by operating activities:
Net unrealized (gain) loss on investment equity securities									(770)	336
Stock-based compensation expense									118	117	102
Accretion of discounts on investment securities									1,501	1,434	1,694
Increase (decrease) in other liabilities									(44)	601	421
Decrease (increase) in other assets									423	73	(887)
Deferred income tax provision (benefit)									319	258	2,322
Net cash provided by operating activities									13,898	16,651	16,162
Investing activities
Purchase of investment equity securities									(9,030)	(9,763)	(9,998)
Purchase of investment securities available-for-sale									(113,688)	(26,473)	(75,267)
Proceeds from sale of investment equity securities									11,838	4,902	14,422
Proceeds from sale of investment securities available-for-sale									47,851	4,159	28,087
Net cash used in investing activities									(33,574)	(33,111)	(91,182)
Financing activities
Cash dividend paid									(4,086)	(3,863)	(3,731)
Proceeds from issuance of common stock									591	684	672
Net cash provided by financing activities									23,826	13,587	80,630
Increase (decrease) in cash and cash equivalents									4,150	(2,873)	5,610
Cash and cash equivalents at beginning of year				13,458				16,331	13,458	16,331	10,721
Cash and cash equivalents at end of period	17,608				13,458				17,608	13,458	16,331
Parent Company [Member]
Operating Activities
Net income									12,357	11,335	8,289
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed income from subsidiary									(6,828)	(7,714)	(4,102)
Net securities (gains) losses									(1,781)	79	(1,477)
Net unrealized (gain) loss on investment equity securities									(770)	336
Stock-based compensation expense									118	117	102
Accretion of discounts on investment securities									(45)
Increase (decrease) in other liabilities									762	(403)	335
Decrease (increase) in other assets									126	(147)	(3)
Deferred income tax provision (benefit)									247	(158)	98
Net cash provided by operating activities									4,186	3,445	3,242
Investing activities
Purchase of investment equity securities									(9,030)	(9,763)	(9,998)
Purchase of investment securities available-for-sale									(8,730)
Proceeds from sale of investment equity securities									11,838	4,902	14,422
Proceeds from sale of investment securities available-for-sale									8,775
Net cash used in investing activities									2,853	(4,861)	4,424
Financing activities
Cash dividend paid									(4,086)	(3,863)	(3,731)
Proceeds from issuance of common stock									591	684	672
Net cash provided by financing activities									(3,495)	(3,179)	(3,059)
Increase (decrease) in cash and cash equivalents									3,544	(4,595)	4,607
Cash and cash equivalents at beginning of year				$ 72				$ 4,667	72	4,667	60
Cash and cash equivalents at end of period	$ 3,616				$ 72				$ 3,616	$ 72	$ 4,667