Note 9 - Commitments and Contingencies - Summary of Bank's Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financial instruments with off balance sheet risk	$ 122,185	$ 113,038
Commitments to Extend Credit [Member]
Financial instruments with off balance sheet risk	121,634	111,778
Standby Letters of Credit [Member]
Financial instruments with off balance sheet risk	$ 551	$ 1,260