Note 18 - Commitments and Contingencies - Summary of Bank's Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financial instruments with off balance sheet risk	$ 96,503	$ 78,204
Commitments to Extend Credit [Member]
Financial instruments with off balance sheet risk	95,190	76,977
Standby Letters of Credit [Member]
Financial instruments with off balance sheet risk	$ 1,313	$ 1,227