Note 8 - Non-accrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Receivables Non Accrual Status [Line Items]
Loans receivable	$ 150	$ 11
Loans receivable	8,237	9,420
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivables Non Accrual Status [Line Items]
Loans receivable	0	0
Loans receivable	2,908	3,433
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivables Non Accrual Status [Line Items]
Loans receivable	0	0
Loans receivable	0	0
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]
Financing Receivables Non Accrual Status [Line Items]
Loans receivable	0	0
Loans receivable	3,319	3,627
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]
Financing Receivables Non Accrual Status [Line Items]
Loans receivable	0	0
Loans receivable	1,417	1,803
State and Political Subdivisions Portfolio Segment [Member]
Financing Receivables Non Accrual Status [Line Items]
Loans receivable	0	0
Loans receivable	0	0
Finance Leases Portfolio Segment [Member]
Financing Receivables Non Accrual Status [Line Items]
Loans receivable	150	11
Loans receivable	132	143
Retail Portfolio Segment [Member] | Consumer Loans [Member]
Financing Receivables Non Accrual Status [Line Items]
Loans receivable	0	0
Loans receivable	95	0
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]
Financing Receivables Non Accrual Status [Line Items]
Loans receivable	0	0
Loans receivable	270	287
Retail Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivables Non Accrual Status [Line Items]
Loans receivable	0	0
Loans receivable	$ 96	$ 127