Note 13 - Financial Instruments With Off-balance Sheet Risk - Financial Instruments Outstanding Representing Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commitments to Extend Credit [Member]
Off balance sheet liability, amount	$ 145,635	$ 161,222
Standby Letters of Credit 1 [Member]
Off balance sheet liability, amount	16,092	16,351
Interest Rate Lock Commitments [Member]
Off balance sheet liability, amount	$ 13,013	$ 14,130