Note 4 - Allowance for Loan Losses and Impaired Loans - Allowance for Loan Losses and Recorded Investment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Balance	$ 5,342	$ 4,654	$ 4,900	$ 3,893
Charge-offs	(30)	(159)	(81)	(237)
Recoveries	19	8	155	111
Provision for Loan and Lease Losses, Total	219	291	576	1,027
Balance	5,550	4,794	5,550	4,794
Ending balance: individually evaluated for impairment	5		5		$ 0
Ending balance: collectively evaluated for impairment	5,545		5,545		4,900
Loans receivable, gross	686,117		686,117		664,095
Construction and Development Loan [Member]
Balance	428	415	499	305
Charge-offs	0	(8)	0	(8)
Recoveries	1	0	3	4
Provision for Loan and Lease Losses, Total	59	0	(14)	106
Balance	488	407	488	407
Ending balance: individually evaluated for impairment	5		5		0
Ending balance: collectively evaluated for impairment	483		483		499
Loans receivable, gross	44,435		44,435		46,053
Allowance for loan losses, ending balance: individually evaluated for impairment	732		732		0
Allowance for loan losses, ending balance: collectively evaluated for impairment	43,703		43,703		46,053
Construction and Development Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Balance			0
Balance	0		0
Loans receivable, gross	0		0		0
Farmland Loan [Member]
Balance	344	472	406	487
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for Loan and Lease Losses, Total	(32)	(8)	(94)	(23)
Balance	312	464	312	464
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	312		312		406
Loans receivable, gross	28,082		28,082		32,449
Allowance for loan losses, ending balance: individually evaluated for impairment	2,349		2,349		2,580
Allowance for loan losses, ending balance: collectively evaluated for impairment	25,733		25,733		29,869
Farmland Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Balance			0
Balance	0		0
Loans receivable, gross	0		0		0
Residential Loan [Member]
Balance	2,320	2,126	2,167	1,822
Charge-offs	0	(48)	0	(48)
Recoveries	0	0	2	11
Provision for Loan and Lease Losses, Total	117	89	268	382
Balance	2,437	2,167	2,437	2,167
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	2,437		2,437		2,167
Loans receivable, gross	292,670		292,670		279,893
Allowance for loan losses, ending balance: individually evaluated for impairment	0		0		0
Allowance for loan losses, ending balance: collectively evaluated for impairment	292,533		292,533		279,751
Residential Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Balance			0
Balance	0		0
Loans receivable, gross	137		137		142
Commercial Mortgage Loan [Member]
Balance	1,843	1,051	1,421	924
Charge-offs	0	(61)	0	(61)
Recoveries	0	0	61	65
Provision for Loan and Lease Losses, Total	86	246	447	308
Balance	1,929	1,236	1,929	1,236
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	1,929		1,929		1,421
Loans receivable, gross	229,118		229,118		203,886
Allowance for loan losses, ending balance: individually evaluated for impairment	0		0		0
Allowance for loan losses, ending balance: collectively evaluated for impairment	229,014		229,014		203,773
Commercial Mortgage Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Balance			0
Balance	0		0
Loans receivable, gross	104		104		113
Commercial and Agricultural Loan [Member]
Balance	273	450	293	211
Charge-offs	(8)	(14)	(8)	(14)
Recoveries	8	0	53	2
Provision for Loan and Lease Losses, Total	(3)	(38)	(68)	199
Balance	270	398	270	398
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	270		270		293
Loans receivable, gross	32,726		32,726		33,663
Allowance for loan losses, ending balance: individually evaluated for impairment	0		0		0
Allowance for loan losses, ending balance: collectively evaluated for impairment	32,630		32,630		33,567
Commercial and Agricultural Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Balance			0
Balance	0		0
Loans receivable, gross	96		96		96
Consumer and Other Loan [Member]
Balance	134	140	114	144
Charge-offs	(22)	(28)	(73)	(106)
Recoveries	10	8	36	29
Provision for Loan and Lease Losses, Total	(8)	2	37	55
Balance	114	$ 122	114	$ 122
Ending balance: individually evaluated for impairment	0		0		0
Ending balance: collectively evaluated for impairment	114		114		114
Loans receivable, gross	21,324		21,324		17,033
Allowance for loan losses, ending balance: individually evaluated for impairment	0		0		0
Allowance for loan losses, ending balance: collectively evaluated for impairment	21,324		21,324		17,033
Consumer and Other Loan [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Balance			0
Balance	0		0
Loans receivable, gross	0		0		0
Loans Excluding SBA PPP Loans [Member]
Loans receivable, gross	648,355		648,355		612,977
Allowance for loan losses, ending balance: individually evaluated for impairment	3,081		3,081		2,580
Allowance for loan losses, ending balance: collectively evaluated for impairment	644,937		644,937		610,046
Loans Excluding SBA PPP Loans [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Balance			0
Balance	0		0
Loans receivable, gross	$ 337		$ 337		$ 351

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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