Note 6 - Allowance for Loan Losses and Impaired Loans - Analysis of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Past due	$ 3,080	$ 3,250
Current	567,273	533,215
Loans receivable	570,353	536,465
Past due and still accruing
Nonaccrual loans	4,979	5,579
Construction and Development Loan [Member]
Past due	10	29
Current	39,639	33,420
Loans receivable	39,649	33,449
Past due and still accruing
Nonaccrual loans	10
Farmland Loan [Member]
Past due	1,864	1,160
Current	32,302	32,131
Loans receivable	34,166	33,291
Past due and still accruing
Nonaccrual loans	4,192	3,914
Residential Loan [Member]
Past due	705	1,148
Current	252,969	234,541
Loans receivable	253,674	235,689
Past due and still accruing
Nonaccrual loans	412	653
Commercial Mortgage Loan [Member]
Past due	185	604
Current	190,632	175,588
Loans receivable	190,817	176,192
Past due and still accruing
Nonaccrual loans	198	740
Commercial and Agricultural Loan [Member]
Past due	306	271
Current	32,120	37,220
Loans receivable	32,426	37,491
Past due and still accruing
Nonaccrual loans	165	264
Consumer and Other Loan [Member]
Past due	10	38
Current	19,611	20,315
Loans receivable	19,621	20,353
Past due and still accruing
Nonaccrual loans	2	8
Financial Asset, 30 to 59 Days Past Due [Member]
Past due	1,507	881
Financial Asset, 30 to 59 Days Past Due [Member] \| Construction and Development Loan [Member]
Past due		29
Financial Asset, 30 to 59 Days Past Due [Member] \| Farmland Loan [Member]
Past due	893	71
Financial Asset, 30 to 59 Days Past Due [Member] \| Residential Loan [Member]
Past due	292	762
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Mortgage Loan [Member]
Past due	185
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial and Agricultural Loan [Member]
Past due	135	7
Financial Asset, 30 to 59 Days Past Due [Member] \| Consumer and Other Loan [Member]
Past due	2	12
Financial Asset, 60 to 89 Days Past Due [Member]
Past due	62	263
Financial Asset, 60 to 89 Days Past Due [Member] \| Construction and Development Loan [Member]
Past due
Financial Asset, 60 to 89 Days Past Due [Member] \| Farmland Loan [Member]
Past due		100
Financial Asset, 60 to 89 Days Past Due [Member] \| Residential Loan [Member]
Past due	48	145
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Mortgage Loan [Member]
Past due
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial and Agricultural Loan [Member]
Past due	8
Financial Asset, 60 to 89 Days Past Due [Member] \| Consumer and Other Loan [Member]
Past due	6	18
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Past due	1,511	2,106
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Construction and Development Loan [Member]
Past due	10
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Farmland Loan [Member]
Past due	971	989
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Residential Loan [Member]
Past due	365	241
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial Mortgage Loan [Member]
Past due		604
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Commercial and Agricultural Loan [Member]
Past due	163	264
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] \| Consumer and Other Loan [Member]
Past due	$ 2	$ 8

Amount of financing receivable 90 days or more past due and still accruing.

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