Note 4 - Loans - Newly Restructured Loans and Types of Modifications (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Financing receivable modifications	$ 125	$ 125
Commercial Portfolio Segment [Member]
Financing receivable modifications	86	86
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Equity Lines [Member]
Financing receivable modifications	39	39
Extended Maturity [Member]
Financing receivable modifications	86	86
Extended Maturity [Member] | Commercial Portfolio Segment [Member]
Financing receivable modifications	86	86
Extended Maturity [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Equity Lines [Member]
Financing receivable modifications
Payment Deferral [Member]
Financing receivable modifications	39	39
Payment Deferral [Member] | Commercial Portfolio Segment [Member]
Financing receivable modifications
Payment Deferral [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Equity Lines [Member]
Financing receivable modifications	$ 39	$ 39