Note 5 - Allowances for Loan Losses - Non-accrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Non-accrual loans	$ 12,413	$ 10,341
Commercial Real Estate Portfolio Segment [Member]
Non-accrual loans	4,159	4,631
Construction and Land Development Portfolio Segment [Member]
Non-accrual loans
Commercial Portfolio Segment [Member]
Non-accrual loans	3,087	3,661
Owner Occupied Real Estate [Member]
Non-accrual loans	3,337	1,188
Consumer Portfolio Segment [Member]
Non-accrual loans	1,062	861
Residential Portfolio Segment [Member]
Non-accrual loans	$ 768