Note 3 - Loans and Allowance for Loan Losses (Details) - Troubled Debt Restructuring by Accrual Status (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Recorded Investment in loans	$ 308,335	$ 294,478
Troubled Debt Restructuring [Member] | Residential Mortgage Segment [Member]
Financing Receivable, Modifications [Line Items]
Accruing	495	508
Nonaccrual	169	226
Recorded Investment in loans	664	734
Related Allowance for Loan Losses	6	45
Troubled Debt Restructuring [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,205	1,130
Nonaccrual	341	0
Recorded Investment in loans	1,546	1,130
Related Allowance for Loan Losses	0	0
Troubled Debt Restructuring [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	1,676	1,709
Recorded Investment in loans	1,676	1,709
Related Allowance for Loan Losses	1,226	1,259
Troubled Debt Restructuring [Member] | Home Equity And Second Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Accruing	22	24
Nonaccrual	0	0
Recorded Investment in loans	22	24
Related Allowance for Loan Losses	0	0
Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,722	1,662
Nonaccrual	2,186	1,935
Recorded Investment in loans	3,908	3,597
Related Allowance for Loan Losses	1,232	1,304
Residential Mortgage Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment in loans	104,383	107,508
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment in loans	80,157	76,666
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment in loans	29,771	22,003
Home Equity And Second Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment in loans	$ 37,217	$ 35,269