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Note 4 - Debt and Equity Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Less than 12 months, estimated fair value $ 19,522 $ 63,376
Less than 12 months, unrealized losses (73) (268)
12 months or more, estimated fair value 1,076 10,408
12 months or more, unrealized losses (8) (180)
Total estimated fair value 20,598 73,784
Total unrealized losses (81) (448)
US Government Agencies Debt Securities [Member]    
Less than 12 months, estimated fair value 6,016 23,827
Less than 12 months, unrealized losses (7) (85)
12 months or more, estimated fair value 896 2,520
12 months or more, unrealized losses (6) (4)
Total estimated fair value 6,912 26,347
Total unrealized losses (13) (89)
US Treasury Securities [Member]    
Less than 12 months, estimated fair value   3,023
Less than 12 months, unrealized losses   (4)
12 months or more, estimated fair value   0
12 months or more, unrealized losses   0
Total estimated fair value   3,023
Total unrealized losses   (4)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Less than 12 months, estimated fair value 5,097 14,885
Less than 12 months, unrealized losses (31) (28)
12 months or more, estimated fair value 0 1,934
12 months or more, unrealized losses 0 (6)
Total estimated fair value 5,097 16,819
Total unrealized losses (31) (34)
US States and Political Subdivisions Debt Securities [Member]    
Less than 12 months, estimated fair value 7,875 17,512
Less than 12 months, unrealized losses (34) (125)
12 months or more, estimated fair value 180 5,954
12 months or more, unrealized losses (2) (170)
Total estimated fair value 8,055 23,466
Total unrealized losses (36) (295)
Corporate Debt Securities [Member]    
Less than 12 months, estimated fair value 534 4,129
Less than 12 months, unrealized losses (1) (26)
12 months or more, estimated fair value 0 0
12 months or more, unrealized losses 0 0
Total estimated fair value 534 4,129
Total unrealized losses $ (1) $ (26)