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Note 7 - Debt and Equity Securities - Securities Available-for-sale Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Securities available-for-sale:    
Less than 12 months, estimated fair value $ 147,495 $ 63,376
Less than 12 months, unrealized losses (3,307) (268)
12 months or more, estimated fair value 1,910 10,408
12 months or more, unrealized losses (14) (180)
Total estimated fair value 149,405 73,784
Total unrealized losses (3,321) (448)
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
12 months or more, unrealized losses
Total estimated fair value 3,023
Total unrealized losses (4)
US Government Agencies Debt Securities [Member]    
Securities available-for-sale:    
Less than 12 months, estimated fair value 3,921 23,827
Less than 12 months, unrealized losses (62) (85)
12 months or more, estimated fair value 2,520
12 months or more, unrealized losses (4)
Total estimated fair value 3,921 26,347
Total unrealized losses (62) (89)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available-for-sale:    
Less than 12 months, estimated fair value 14,885
Less than 12 months, unrealized losses (28)
12 months or more, estimated fair value 1,734 1,934
12 months or more, unrealized losses (6) (6)
Total estimated fair value 1,734 16,819
Total unrealized losses (6) (34)
US States and Political Subdivisions Debt Securities [Member]    
Securities available-for-sale:    
Less than 12 months, estimated fair value 106,027 17,512
Less than 12 months, unrealized losses (2,298) (125)
12 months or more, estimated fair value 176 5,954
12 months or more, unrealized losses (8) (170)
Total estimated fair value 106,203 23,466
Total unrealized losses (2,306) (295)
Corporate Debt Securities [Member]    
Securities available-for-sale:    
Less than 12 months, estimated fair value 37,547 4,129
Less than 12 months, unrealized losses (947) (26)
12 months or more, estimated fair value
12 months or more, unrealized losses
Total estimated fair value 37,547 4,129
Total unrealized losses $ (947) $ (26)