Note 5 - Loans - Newly Restructured Loans and Types of Modifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Contractual Interest Rate Reduction [Member] | Commercial Portfolio Segment [Member]
Financing receivable modifications
Contractual Interest Rate Reduction [Member] | Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member]
Financing receivable modifications				112
Contractual Interest Rate Reduction [Member]
Financing receivable modifications				112
Interest Rate Reduction and Extension of Maturity [Member] | Commercial Portfolio Segment [Member]
Financing receivable modifications	1,058		1,058
Interest Rate Reduction and Extension of Maturity [Member] | Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member]
Financing receivable modifications
Interest Rate Reduction and Extension of Maturity [Member]
Financing receivable modifications	1,058		1,058
Rate Reduction and Payment Deferral [Member] | Commercial Portfolio Segment [Member]
Financing receivable modifications
Rate Reduction and Payment Deferral [Member] | Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member]
Financing receivable modifications		209		262
Rate Reduction and Payment Deferral [Member]
Financing receivable modifications		209		262
Payment Deferral [Member] | Commercial Portfolio Segment [Member]
Financing receivable modifications				761
Payment Deferral [Member] | Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member]
Financing receivable modifications				104
Payment Deferral [Member]
Financing receivable modifications				865
Commercial Portfolio Segment [Member]
Financing receivable modifications	1,058		1,058	761
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member]
Financing receivable modifications		209		478
Financing receivable modifications	$ 1,058	$ 209	$ 1,058	$ 1,239