Note 4 - Loans and the Allowance for Loan Losses - Credit Risk Profile by Internally Assigned Grade (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Performing Financial Instruments [Member]
Loans	$ 53,343	$ 48,300
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Nonperforming Financial Instruments [Member]
Loans	121	65
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans	53,464	48,365
Consumer Portfolio Segment [Member] | Other Loans [Member] | Performing Financial Instruments [Member]
Loans	3,613	3,582
Consumer Portfolio Segment [Member] | Other Loans [Member] | Nonperforming Financial Instruments [Member]
Loans
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans	3,613	3,582
Consumer Portfolio Segment [Member] | Residential Portfolio Segment [Member]
Loans	57,077
Consumer Portfolio Segment [Member] | Commercial Portfolio Segment [Member]
Loans		51,947
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	56,956	51,882
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans	121	65
Loans	$ 446,913	$ 400,971