Note 4 - Allowance for Loan Losses (Details) - Allowance for Loan Losses - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Commercial and Agricultural
Allowance for loan losses, beginning balance			$ 8,802	$ 11,806
Allowance for loan losses, charge-offs			(1,306)	(2,588)
Allowance for loan losses, recoveries			493	444
Allowance for loan losses, provision	$ 129	$ 481	491	808
Allowance for loan losses, ending balance	8,480	10,470	8,480	10,470
Allowance for loan losses, individually evaluated for impairment	767	2,266	767	2,266
Allowance for loan losses, collectively evaluated for impairment	7,713	8,204	7,713	8,204
Loans receivable, individually evaluated for impairment	29,078	37,862	29,078	37,862
Loans receivable, collectively evaluated for impairment	731,000	697,901	731,000	697,901
Loans receivable	760,078	735,763	760,078	735,763	$ 746,094
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]
Commercial and Agricultural
Allowance for loan losses, beginning balance			497	1,017
Allowance for loan losses, charge-offs			(185)	(373)
Allowance for loan losses, recoveries			23	58
Allowance for loan losses, provision			11	18
Allowance for loan losses, ending balance	346	720	346	720
Allowance for loan losses, individually evaluated for impairment	92	102	92	102
Allowance for loan losses, collectively evaluated for impairment	254	618	254	618
Loans receivable, individually evaluated for impairment	91	1,068	91	1,068
Loans receivable, collectively evaluated for impairment	52,415	40,772	52,415	40,772
Loans receivable	52,506	41,840	52,506	41,840	50,960
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]
Commercial and Agricultural
Allowance for loan losses, beginning balance			304	294
Allowance for loan losses, charge-offs			0	0
Allowance for loan losses, recoveries			2	1
Allowance for loan losses, provision			3	5
Allowance for loan losses, ending balance	309	300	309	300
Allowance for loan losses, individually evaluated for impairment	0	0	0	0
Allowance for loan losses, collectively evaluated for impairment	309	300	309	300
Loans receivable, individually evaluated for impairment	8	0	8	0
Loans receivable, collectively evaluated for impairment	24,011	18,568	24,011	18,568
Loans receivable	24,019	18,568	24,019	18,568	16,689
Real Estate Portfolio Segment [Member] | Commercial [Member]
Commercial and Agricultural
Allowance for loan losses, beginning balance			3,665	4,379
Allowance for loan losses, charge-offs			(166)	(753)
Allowance for loan losses, recoveries			128	43
Allowance for loan losses, provision			195	323
Allowance for loan losses, ending balance	3,822	3,992	3,822	3,992
Allowance for loan losses, individually evaluated for impairment	278	772	278	772
Allowance for loan losses, collectively evaluated for impairment	3,544	3,220	3,544	3,220
Loans receivable, individually evaluated for impairment	20,537	26,204	20,537	26,204
Loans receivable, collectively evaluated for impairment	320,630	306,691	320,630	306,691
Loans receivable	341,167	332,895	341,167	332,895	332,231
Real Estate Portfolio Segment [Member] | Commercial Constuction [Member]
Commercial and Agricultural
Allowance for loan losses, beginning balance			1,223	1,782
Allowance for loan losses, charge-offs			(96)	(470)
Allowance for loan losses, recoveries			272	254
Allowance for loan losses, provision			187	308
Allowance for loan losses, ending balance	1,586	1,874	1,586	1,874
Allowance for loan losses, individually evaluated for impairment	18	1,082	18	1,082
Allowance for loan losses, collectively evaluated for impairment	1,568	792	1,568	792
Loans receivable, individually evaluated for impairment	3,313	4,812	3,313	4,812
Loans receivable, collectively evaluated for impairment	43,386	45,368	43,386	45,368
Loans receivable	46,699	50,180	46,699	50,180	51,259
Real Estate Portfolio Segment [Member] | Residential Construction [Member]
Commercial and Agricultural
Allowance for loan losses, beginning balance			138	138
Allowance for loan losses, charge-offs			0	0
Allowance for loan losses, recoveries			0	0
Allowance for loan losses, provision			0	0
Allowance for loan losses, ending balance	138	138	138	138
Allowance for loan losses, individually evaluated for impairment	0	0	0	0
Allowance for loan losses, collectively evaluated for impairment	138	138	138	138
Loans receivable, individually evaluated for impairment	0	0	0	0
Loans receivable, collectively evaluated for impairment	11,327	10,875	11,327	10,875
Loans receivable	11,327	10,875	11,327	10,875	11,221
Real Estate Portfolio Segment [Member] | Residential [Member]
Commercial and Agricultural
Allowance for loan losses, beginning balance			2,425	3,278
Allowance for loan losses, charge-offs			(744)	(585)
Allowance for loan losses, recoveries			35	25
Allowance for loan losses, provision			57	92
Allowance for loan losses, ending balance	1,773	2,810	1,773	2,810
Allowance for loan losses, individually evaluated for impairment	320	310	320	310
Allowance for loan losses, collectively evaluated for impairment	1,453	2,500	1,453	2,500
Loans receivable, individually evaluated for impairment	3,432	4,815	3,432	4,815
Loans receivable, collectively evaluated for impairment	199,373	196,698	199,373	196,698
Loans receivable	202,805	201,513	202,805	201,513	203,753
Real Estate Portfolio Segment [Member] | Farmland [Member]
Commercial and Agricultural
Allowance for loan losses, beginning balance			104	312
Allowance for loan losses, charge-offs			0	(234)
Allowance for loan losses, recoveries			0	0
Allowance for loan losses, provision			2	4
Allowance for loan losses, ending balance	106	82	106	82
Allowance for loan losses, individually evaluated for impairment	59	0	59	0
Allowance for loan losses, collectively evaluated for impairment	47	82	47	82
Loans receivable, individually evaluated for impairment	1,697	963	1,697	963
Loans receivable, collectively evaluated for impairment	52,438	48,212	52,438	48,212
Loans receivable	54,135	49,175	54,135	49,175	49,951
Consumer and Other Portfolio Segment [Member] | Consumer [Member]
Commercial and Agricultural
Allowance for loan losses, beginning balance			67	243
Allowance for loan losses, charge-offs			(90)	(173)
Allowance for loan losses, recoveries			30	51
Allowance for loan losses, provision			35	57
Allowance for loan losses, ending balance	42	178	42	178
Allowance for loan losses, individually evaluated for impairment	0	0	0	0
Allowance for loan losses, collectively evaluated for impairment	42	178	42	178
Loans receivable, individually evaluated for impairment	0	0	0	0
Loans receivable, collectively evaluated for impairment	21,371	23,548	21,371	23,548
Loans receivable	21,371	23,548	21,371	23,548	22,820
Consumer and Other Portfolio Segment [Member] | Other [Member]
Commercial and Agricultural
Allowance for loan losses, beginning balance			379	363
Allowance for loan losses, charge-offs			(25)	0
Allowance for loan losses, recoveries			3	12
Allowance for loan losses, provision			1	1
Allowance for loan losses, ending balance	358	376	358	376
Allowance for loan losses, individually evaluated for impairment	0	0	0	0
Allowance for loan losses, collectively evaluated for impairment	358	376	358	376
Loans receivable, individually evaluated for impairment	0	0	0	0
Loans receivable, collectively evaluated for impairment	6,049	7,169	6,049	7,169
Loans receivable	$ 6,049	$ 7,169	$ 6,049	$ 7,169	$ 7,210