Note 5 - Loans - Newly Restructured Loans and Types of Modifications (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Financing receivable modifications	$ 139		$ 139
Commercial Portfolio Segment [Member] | Interest Rate Reduction and Extension of Maturity [Member]
Financing receivable modifications		$ 45	951	$ 45
Commercial Portfolio Segment [Member] | Principal Forgiveness [Member]
Financing receivable modifications
Commercial Portfolio Segment [Member] | Payment Deferral [Member]
Financing receivable modifications				734
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Financing receivable modifications
Commercial Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Financing receivable modifications
Commercial Portfolio Segment [Member]
Financing receivable modifications	139	45	1,090	779
Residential Portfolio Segment [Member] | Extended Maturity [Member]
Financing receivable modifications
Residential Portfolio Segment [Member] | Interest Rate Reduction and Extension of Maturity [Member]
Financing receivable modifications
Residential Portfolio Segment [Member] | Principal Forgiveness [Member]
Financing receivable modifications	82		82
Residential Portfolio Segment [Member] | Payment Deferral [Member]
Financing receivable modifications		103	118	206
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Financing receivable modifications				115
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Financing receivable modifications				266
Residential Portfolio Segment [Member]
Financing receivable modifications	82	103	200	587
Extended Maturity [Member]
Financing receivable modifications	139		139
Interest Rate Reduction and Extension of Maturity [Member]
Financing receivable modifications		45	951	45
Principal Forgiveness [Member]
Financing receivable modifications	82		82
Payment Deferral [Member]
Financing receivable modifications		103	118	940
Contractual Interest Rate Reduction [Member]
Financing receivable modifications				115
Rate Reduction and Payment Deferral [Member]
Financing receivable modifications				266
Financing receivable modifications	$ 221	$ 148	$ 1,290	$ 1,366