Note 4 - Loans and Allowance for Loan Losses - Individually Impaired Loans by Class of Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Unpaid Principal Balance	$ 23,685	$ 44,632
Recorded Investment With No Allowance	7,182	16,706
Recorded Investment With Allowance	15,959	25,189
Total Recorded Investment	23,141	41,895
Allowance for Loan Losses Allocated	3,182	2,948
Average	35,375	42,979	$ 42,308
Interest Income Recognized	1,723	2,028	1,703
Cash Basis Interest Recognized	1,710	1,943	1,684
Real Estate Portfolio Segment [Member] \| Real Estate Construction and Land Development [Member]
Unpaid Principal Balance	4,076	9,076
Recorded Investment With No Allowance	1,746	2,599
Recorded Investment With Allowance	1,955	3,800
Total Recorded Investment	3,701	6,399
Allowance for Loan Losses Allocated	402	759
Average	5,124	7,706	9,409
Interest Income Recognized	239	310	343
Cash Basis Interest Recognized	239	298	337
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Residential [Member]
Unpaid Principal Balance	10,112	9,930
Recorded Investment With No Allowance	3,233	4,388
Recorded Investment With Allowance	6,877	5,590
Total Recorded Investment	10,110	9,978
Allowance for Loan Losses Allocated	1,973	1,503
Average	10,337	9,146	9,810
Interest Income Recognized	525	491	448
Cash Basis Interest Recognized	521	465	438
Real Estate Portfolio Segment [Member] \| Real Estate Mortgage Farmland and Other Commercial Enterprises [Member]
Unpaid Principal Balance	8,737	25,045
Recorded Investment With No Allowance	2,203	9,699
Recorded Investment With Allowance	6,367	15,235
Total Recorded Investment	8,570	24,934
Allowance for Loan Losses Allocated	319	304
Average	19,139	25,557	22,439
Interest Income Recognized	917	1,197	890
Cash Basis Interest Recognized	908	1,153	887
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Unpaid Principal Balance	448	435
Recorded Investment With No Allowance		20
Recorded Investment With Allowance	448	418
Total Recorded Investment	448	438
Allowance for Loan Losses Allocated	270	236
Average	440	419	523
Interest Income Recognized	25	23	16
Cash Basis Interest Recognized	25	21	16
Commercial Portfolio Segment [Member] \| Commercial Other [Member]
Unpaid Principal Balance
Recorded Investment With No Allowance
Recorded Investment With Allowance
Total Recorded Investment
Allowance for Loan Losses Allocated
Average	6
Interest Income Recognized
Cash Basis Interest Recognized
Consumer Portfolio Segment [Member] \| Consumer Unsecured [Member]
Unpaid Principal Balance	312	146
Recorded Investment With No Allowance
Recorded Investment With Allowance	312	146
Total Recorded Investment	312	146
Allowance for Loan Losses Allocated	218	146
Average	329	151	127
Interest Income Recognized	17	7	6
Cash Basis Interest Recognized	$ 17	$ 6	$ 6

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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