Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans and Loans Past Due 90 Days Or More and Still Accruing - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Residential Portfolio Segment [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans and Loans Past Due 90 Days Or More and Still Accruing [Line Items]
Loans past due 90 days and still accruing	$ 90	$ 20
Nonaccrual	2,103	2,048
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans and Loans Past Due 90 Days Or More and Still Accruing [Line Items]
Nonaccrual	367	404
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans and Loans Past Due 90 Days Or More and Still Accruing [Line Items]
Nonaccrual	2,635	2,737
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans and Loans Past Due 90 Days Or More and Still Accruing [Line Items]
Nonaccrual	769	769
Commercial and Industrial Portfolio Segment [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans and Loans Past Due 90 Days Or More and Still Accruing [Line Items]
Nonaccrual	1,185	1,152
Consumer Portfolio Segment [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans and Loans Past Due 90 Days Or More and Still Accruing [Line Items]
Loans past due 90 days and still accruing	141	39
Nonaccrual	7,142	7,236
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans and Loans Past Due 90 Days Or More and Still Accruing [Line Items]
Loans past due 90 days and still accruing	47	18
Nonaccrual	15	27
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans and Loans Past Due 90 Days Or More and Still Accruing [Line Items]
Nonaccrual	63	96
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Nonaccrual Loans and Loans Past Due 90 Days Or More and Still Accruing [Line Items]
Loans past due 90 days and still accruing	4	1
Nonaccrual	$ 5	$ 3