Note 5 - Loans Receivable and Allowance for Loan and Lease Losses - Recorded Investment in TDRs (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
TDR Loan	$ 2,100,000	$ 3,000,000
Business Activities Loans [Member]
TDR Loan	2,066,000	2,976,000
Business Activities Loans [Member] | Non-Accrual Loans [Member]
TDR Loan
Business Activities Loans [Member] | Accrual Loans [Member]
TDR Loan	2,066,000	2,976,000
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
TDR Loan	1,081,000	1,977,000
Residential Portfolio Segment [Member] | Business Activities Loans [Member]
TDR Loan	296,000	309,000
Consumer and Other Portfolio Segment [Member] | Business Activities Loans [Member]
TDR Loan	$ 689,000	$ 690,000