Note 13 - Commitments and Contingencies - Financial Instruments Whose Contract Amounts Represent Credit Risk (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Fair value of off-balance sheet risks	$ 164,672
Undisbursed Loan Commitments [Member]
Fair value of off-balance sheet risks	144,401
Checking Reserve [Member]
Fair value of off-balance sheet risks	1,302
Equity Line [Member]
Fair value of off-balance sheet risks	15,826
Standby Letters of Credit [Member]
Fair value of off-balance sheet risks	$ 3,143