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Note 2 - Debt Securities - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jan. 01, 2021
[1]
Dec. 31, 2020
Securities available for sale, amortized cost $ 77,048   $ 81,958
Securities available for sale, unrealized gains 983   1,501
Securities available for sale, unrealized losses (591)   (101)
Securities available for sale, fair value 77,440 $ 83,358 83,358 [2]
US Government Agencies Debt Securities [Member]      
Securities available for sale, amortized cost 491   555
Securities available for sale, unrealized gains 0   0
Securities available for sale, unrealized losses (3)   (4)
Securities available for sale, fair value 488   551
US States and Political Subdivisions Debt Securities [Member]      
Securities available for sale, amortized cost 31,866   43,950
Securities available for sale, unrealized gains 240   509
Securities available for sale, unrealized losses 0   0
Securities available for sale, fair value 32,106   44,459
Corporate Debt Securities [Member]      
Securities available for sale, amortized cost 4,883    
Securities available for sale, unrealized gains 0    
Securities available for sale, unrealized losses (3)    
Securities available for sale, fair value 4,880    
Mortgage-backed Agency Securities [Member]      
Securities available for sale, amortized cost 39,808   37,453
Securities available for sale, unrealized gains 743   992
Securities available for sale, unrealized losses (585)   (97)
Securities available for sale, fair value $ 39,966   $ 38,348
[1] Per our analysis no ACL was necessary for investment securities available-for-sale.
[2] Derived from audited financial statements