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Note 7 - Debt Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Securities available-for-sale:    
Less than 12 months, estimated fair value $ 27,595 $ 63,376
Less than 12 months, unrealized losses (82) (268)
12 months or more, estimated fair value 1,097 10,408
12 months or more, unrealized losses (9) (180)
Total estimated fair value 28,692 73,784
Total unrealized losses (91) (448)
US Government Agencies Debt Securities [Member]    
Securities available-for-sale:    
Less than 12 months, estimated fair value 0 23,827
Less than 12 months, unrealized losses 0 (85)
12 months or more, estimated fair value 917 2,520
12 months or more, unrealized losses (6) (4)
Total estimated fair value 917 26,347
Total unrealized losses (6) (89)
US Treasury Securities [Member]    
Securities available-for-sale:    
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]    
Securities available-for-sale:    
Less than 12 months, estimated fair value 21,671 14,885
Less than 12 months, unrealized losses (50) (28)
12 months or more, estimated fair value 0 1,934
12 months or more, unrealized losses 0 (6)
Total estimated fair value 21,671 16,819
Total unrealized losses (50) (34)
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale:    
Less than 12 months, estimated fair value 5,924 17,512
Less than 12 months, unrealized losses (32) (125)
12 months or more, estimated fair value 180 5,954
12 months or more, unrealized losses (3) (170)
Total estimated fair value 6,104 23,466
Total unrealized losses $ (35) (295)
Corporate Debt Securities [Member]    
Securities available-for-sale:    
Less than 12 months, estimated fair value   4,129
Less than 12 months, unrealized losses   (26)
12 months or more, estimated fair value   0
12 months or more, unrealized losses   0
Total estimated fair value   4,129
Total unrealized losses   $ (26)