Note 8 - Deposits - Summary of Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Non-interest bearing checking accounts, amount	$ 36,227	$ 15,775
Money market accounts, amount	60,630	25,504
Certificates of deposit	200,443	184,452
Total deposits	299,043	227,458
Passbook Accounts [Member]
Interest-bearing deposits, amount	7	5
Savings Accounts [Member]
Interest-bearing deposits, amount	$ 1,736	$ 1,722