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Note 10 - Regulatory Matters (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2015
Undistributed Earnings Available for Dividends $ 3.9      
Percentage of Maximum Limit for Loans and Advances 10.00%      
Maximum Funds Available for Loans and Advances $ 6.0      
Line of Credit Facility, Maximum Borrowing Capacity $ 2.2      
Long-term Line of Credit, Total     $ 1.0  
Capital Conservation Buffer 1.875%   1.25% 0.00%
Scenario, Forecast [Member]        
Capital Conservation Buffer   2.50%