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Note 9 - Borrowings - Federal Home Loan Bank Advances (Details) (Parentheticals)
Dec. 31, 2020
Dec. 31, 2019
Federal Home Loan Bank Advances Maturing November 2024 [Member]    
Interest rate 3.98% 3.98%
Federal Home Loan Bank Advances Maturing April 2020 [Member]    
Interest rate   1.99%
Federal Home Loan Bank Advances Maturing May 2020 [Member]    
Interest rate   2.16%