Note 6 - Loans Receivable and Allowance for Loan Losses - Non-accrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Non-accrual loans	$ 12,449	$ 12,413
Commercial Real Estate Portfolio Segment [Member]
Non-accrual loans	4,578	4,159
Construction and Land Development Portfolio Segment [Member]
Non-accrual loans	0	0
Commercial Portfolio Segment [Member]
Non-accrual loans	2,972	3,087
Owner Occupied Real Estate [Member]
Non-accrual loans	3,103	3,337
Consumer Portfolio Segment [Member]
Non-accrual loans	1,095	1,062
Residential Portfolio Segment [Member]
Non-accrual loans	701	768
Paycheck Protection Program CARES Act [Member]
Non-accrual loans	$ 0	$ 0