Note 4 - Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans past due	$ 3,477	$ 2,564
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans past due	348	141
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans past due	34	35
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans past due	355
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans past due	115	31
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due	789	727
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loans past due	74	75
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due	568	420
Financing Receivables, 30 to 59 Days Past Due [Member]
Loans past due	5,760	3,993
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans past due	1,319	1,484
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans past due	1,305	33
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans past due	48	334
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans past due		2
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans past due	25	88
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due	152	197
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loans past due	70
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due	264	104
Financing Receivables, 60 to 89 Days Past Due [Member]
Loans past due	3,183	2,242
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans past due	1,742	1,708
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans past due	396	371
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans past due	2,402	2,737
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans past due	182	769
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans past due	1,221	1,077
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due	68	36
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loans past due	16	76
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due	46	4
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans past due	6,073	6,778
Residential Portfolio Segment [Member]
Loans past due	6,538	5,756
Loans, current	219,193	218,119
Loans	225,731	223,875
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans past due	2,049	545
Loans, current	68,429	72,913
Loans	70,478	73,458
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans past due	2,484	3,106
Loans, current	81,175	68,896
Loans	83,659	72,002
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans past due	537	771
Loans, current	29,562	23,081
Loans	30,099	23,852
Commercial Real Estate Portfolio Segment [Member]
Loans	184,236	169,312
Commercial and Industrial Portfolio Segment [Member]
Loans past due	1,361	1,196
Loans, current	82,004	80,740
Loans	83,365	81,936
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due	1,009	960
Loans, current	45,230	43,606
Loans	46,239	44,566
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loans past due	160	151
Loans, current	19,552	20,690
Loans	19,712	20,841
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due	878	528
Loans, current	42,775	44,694
Loans	43,653	45,222
Consumer Portfolio Segment [Member]
Loans	109,604	110,629
Loans past due	15,016	13,013
Loans, current	587,920	572,739
Loans	$ 602,936	$ 585,752