Note 13 - Commitments and Contingencies - Financial Instruments Whose Contract Amounts Represent Credit Risk (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Fair value of off-balance sheet risks	$ 153,870
Undisbursed Loan Commitments [Member]
Fair value of off-balance sheet risks	132,784
Checking Reserve [Member]
Fair value of off-balance sheet risks	1,280
Equity Line [Member]
Fair value of off-balance sheet risks	17,478
Standby Letters of Credit [Member]
Fair value of off-balance sheet risks	$ 2,328