Note 8 - Loans and Allowance for Loan Losses (Details) - Past Due Loans - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Commercial:
Loans past due	$ 3,517	$ 6,703
Loans current	574,687	548,548
Loans	578,204	555,251
Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	1,312	1,993
Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due	490	963
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Loans past due	1,715	3,747
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member]
Commercial:
Loans past due	497
Loans current	131,774	118,845
Loans	132,271	118,845
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	486
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Loans past due	11
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Commercial:
Loans past due		466
Loans current	19,031	23,005
Loans	19,031	23,471
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due		466
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]
Commercial:
Loans past due	1,660	4,107
Loans current	210,355	199,427
Loans	212,015	203,534
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	404	28
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due	105	332
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Loans past due	1,151	3,747
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]
Commercial:
Loans past due	741	1,174
Loans current	55,243	51,903
Loans	55,984	53,077
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	136	600
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due	341	574
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Loans past due	264
State and Political Subdivisions Portfolio Segment [Member]
Commercial:
Loans current	42,178	44,104
Loans	42,178	44,104
Finance Leases Portfolio Segment [Member]
Commercial:
Loans past due	221	291
Loans current	9,000	7,394
Loans	9,221	7,685
Finance Leases Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	91	291
Finance Leases Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due	40
Finance Leases Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Loans past due	90
Retail Portfolio Segment [Member]
Commercial:
Loans	107,504	104,535
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member]
Commercial:
Loans past due	199	526
Loans current	38,668	36,621
Loans	38,867	37,147
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due		526
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Loans past due	199
Retail Portfolio Segment [Member] | Home Equity Loan [Member]
Commercial:
Loans past due	185	115
Loans current	64,711	63,098
Loans	64,896	63,213
Retail Portfolio Segment [Member] | Home Equity Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	185	66
Retail Portfolio Segment [Member] | Home Equity Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due		49
Retail Portfolio Segment [Member] | Consumer Loans [Member]
Commercial:
Loans past due	14	24
Loans current	3,727	4,151
Loans	3,741	4,175
Retail Portfolio Segment [Member] | Consumer Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	10	16
Retail Portfolio Segment [Member] | Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due	$ 4	$ 8