Note 6 - Allowance for Loan Losses and Impaired Loans - Allowance for Loan Losses and Recorded Investment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Beginning	$ 3,495	$ 3,453
Charge-offs	(398)	(477)
Recoveries	141	194
Provision for Loan and Lease Losses, Total	655	325
Balance	3,893	3,495
Ending balance: individually evaluated for impairment		41
Ending balance: collectively evaluated for impairment	3,893	3,454
Loans and Leases Receivable, Gross, Total	570,353	536,465
Allowance for loan losses, ending balance: individually evaluated for impairment	4,149	5,570
Allowance for loan losses, ending balance: collectively evaluated for impairment	566,204	530,895
Ending balance: individually evaluated for impairment		41
Ending balance: collectively evaluated for impairment	3,893	3,454
Loans outstanding, ending balance	570,353	536,465
Loans outstanding, ending balance: individually evaluated for impairment	4,149	5,570
Loans outstanding, ending balance: collectively evaluated for impairment	566,204	530,895
Construction and Development Loan [Member]
Beginning	246	239
Charge-offs		(20)
Recoveries
Provision for Loan and Lease Losses, Total	59	27
Balance	305	246
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	305	246
Loans and Leases Receivable, Gross, Total	39,649	33,449
Allowance for loan losses, ending balance: individually evaluated for impairment
Allowance for loan losses, ending balance: collectively evaluated for impairment	39,649	33,449
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	305	246
Loans outstanding, ending balance	39,649	33,449
Loans outstanding, ending balance: individually evaluated for impairment
Loans outstanding, ending balance: collectively evaluated for impairment	39,649	33,449
Farmland Loan [Member]
Beginning	385	358
Charge-offs	(13)
Recoveries		34
Provision for Loan and Lease Losses, Total	115	(7)
Balance	487	385
Ending balance: individually evaluated for impairment		29
Ending balance: collectively evaluated for impairment	487	356
Loans and Leases Receivable, Gross, Total	34,166	33,291
Allowance for loan losses, ending balance: individually evaluated for impairment	3,240	4,552
Allowance for loan losses, ending balance: collectively evaluated for impairment	30,926	28,739
Ending balance: individually evaluated for impairment		29
Ending balance: collectively evaluated for impairment	487	356
Loans outstanding, ending balance	34,166	33,291
Loans outstanding, ending balance: individually evaluated for impairment	3,240	4,552
Loans outstanding, ending balance: collectively evaluated for impairment	30,926	28,739
Residential Loan [Member]
Beginning	1,807	1,875
Charge-offs	(55)	(117)
Recoveries	8	44
Provision for Loan and Lease Losses, Total	62	5
Balance	1,822	1,807
Ending balance: individually evaluated for impairment		12
Ending balance: collectively evaluated for impairment	1,822	1,795
Loans and Leases Receivable, Gross, Total	253,674	235,689
Allowance for loan losses, ending balance: individually evaluated for impairment	909	1,018
Allowance for loan losses, ending balance: collectively evaluated for impairment	252,765	234,671
Ending balance: individually evaluated for impairment		12
Ending balance: collectively evaluated for impairment	1,822	1,795
Loans outstanding, ending balance	253,674	235,689
Loans outstanding, ending balance: individually evaluated for impairment	909	1,018
Loans outstanding, ending balance: collectively evaluated for impairment	252,765	234,671
Commercial Mortgage Loan [Member]
Beginning	682	619
Charge-offs	(41)	(142)
Recoveries	69	69
Provision for Loan and Lease Losses, Total	214	136
Balance	924	682
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	924	682
Loans and Leases Receivable, Gross, Total	190,817	176,192
Allowance for loan losses, ending balance: individually evaluated for impairment
Allowance for loan losses, ending balance: collectively evaluated for impairment	190,817	176,192
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	924	682
Loans outstanding, ending balance	190,817	176,192
Loans outstanding, ending balance: individually evaluated for impairment
Loans outstanding, ending balance: collectively evaluated for impairment	190,817	176,192
Commercial and Agricultural Loan [Member]
Beginning	281	282
Charge-offs	(77)	(23)
Recoveries	10	9
Provision for Loan and Lease Losses, Total	(3)	13
Balance	211	281
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	211	281
Loans and Leases Receivable, Gross, Total	32,426	37,491
Allowance for loan losses, ending balance: individually evaluated for impairment
Allowance for loan losses, ending balance: collectively evaluated for impairment	32,426	37,491
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	211	281
Loans outstanding, ending balance	32,426	37,491
Loans outstanding, ending balance: individually evaluated for impairment
Loans outstanding, ending balance: collectively evaluated for impairment	32,426	37,491
Consumer and Other Loan [Member]
Beginning	94	80
Charge-offs	(212)	(175)
Recoveries	54	38
Provision for Loan and Lease Losses, Total	208	151
Balance	144	94
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	144	94
Loans and Leases Receivable, Gross, Total	19,621	20,353
Allowance for loan losses, ending balance: individually evaluated for impairment
Allowance for loan losses, ending balance: collectively evaluated for impairment	19,621	20,353
Ending balance: individually evaluated for impairment
Ending balance: collectively evaluated for impairment	144	94
Loans outstanding, ending balance	19,621	20,353
Loans outstanding, ending balance: individually evaluated for impairment
Loans outstanding, ending balance: collectively evaluated for impairment	$ 19,621	$ 20,353

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 loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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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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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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