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Note 3 - Securities (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value, Total   $ 1,200,000 $ 2,000,000.0
Equity Securities, FV-NI, Gain (Loss), Total [1]   $ 0 $ 295,000
Visa Inc Class B Common Stock [Member]      
Equity Securities without Readily Determinable Fair Value, Shares Sold (in shares) 25,702    
Equity Securities, FV-NI, Gain (Loss), Total $ 295,000    
[1] Not within the scope of ASC 606