Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	$ 585,845	$ 585,752
Consumer Portfolio Segment [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	108,425	110,629
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	44,952	44,566
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Performing Financial Instruments [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	44,890	44,521
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Nonperforming Financial Instruments [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	62	45
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	19,558	20,841
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Performing Financial Instruments [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	19,495	20,745
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Nonperforming Financial Instruments [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	63	96
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	43,915	45,222
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Performing Financial Instruments [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	43,906	45,218
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member] | Nonperforming Financial Instruments [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	9	4
Residential Portfolio Segment [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	227,026	223,875
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	224,833	221,807
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	2,193	2,068
Consumer and Residential Portfolio Segment [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	335,451	334,504
Consumer and Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	333,124	332,291
Consumer and Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) - Recorded Investment of Residential and Consumer Loans [Line Items]
Loans receivable	$ 2,327	$ 2,213