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Note 2 - Debt Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Securities available for sale, less than 12 months, fair value $ 14,227 $ 42,838
Securities available for sale, less than 12 months, unrealized losses (199) (171)
Securities available for sale, 12 months or longer, fair value 783 33,425
Securities available for sale, 12 months or longer, unrealized losses (3) (1,121)
Securities available for sale, total fair value 15,010 76,263
Securities available for sale, total unrealized losses (202) (1,292)
US Government Agencies Debt Securities [Member]    
Securities available for sale, less than 12 months, fair value 1,039  
Securities available for sale, less than 12 months, unrealized losses (1)  
Securities available for sale, 12 months or longer, fair value  
Securities available for sale, 12 months or longer, unrealized losses  
Securities available for sale, total fair value 1,039  
Securities available for sale, total unrealized losses (1)  
US Treasury Securities [Member]    
Securities available for sale, less than 12 months, fair value   19,960
Securities available for sale, less than 12 months, unrealized losses   (10)
Securities available for sale, 12 months or longer, fair value  
Securities available for sale, 12 months or longer, unrealized losses  
Securities available for sale, total fair value   19,960
Securities available for sale, total unrealized losses   (10)
US States and Political Subdivisions Debt Securities [Member]    
Securities available for sale, less than 12 months, fair value 7,116
Securities available for sale, less than 12 months, unrealized losses (62)
Securities available for sale, 12 months or longer, fair value 268 18,081
Securities available for sale, 12 months or longer, unrealized losses (2) (447)
Securities available for sale, total fair value 268 25,197
Securities available for sale, total unrealized losses (2) (509)
Mortgage-backed Agency Securities [Member]    
Securities available for sale, less than 12 months, fair value 13,188 15,762
Securities available for sale, less than 12 months, unrealized losses (198) (99)
Securities available for sale, 12 months or longer, fair value 515 15,344
Securities available for sale, 12 months or longer, unrealized losses (1) (674)
Securities available for sale, total fair value 13,703 31,106
Securities available for sale, total unrealized losses $ (199) $ (773)