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Note 2 - Debt Securities - Securities Available-for-sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Securities available for sale, amortized cost $ 131,740 $ 153,477
Securities available for sale, unrealized gains 1,323 931
Securities available for sale, unrealized losses (466) (1,292)
Securities available for sale, fair value 132,597 153,116 [1]
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 1,079 1,108
Securities available for sale, unrealized gains 5
Securities available for sale, unrealized losses (1)
Securities available for sale, fair value 1,078 1,113
US Treasury Securities [Member]    
Securities available for sale, amortized cost 19,970
Securities available for sale, unrealized gains
Securities available for sale, unrealized losses (10)
Securities available for sale, fair value 19,960
US States and Political Subdivisions Debt Securities [Member]    
Securities available for sale, amortized cost 95,810 96,886
Securities available for sale, unrealized gains 1,231 912
Securities available for sale, unrealized losses (44) (509)
Securities available for sale, fair value 96,997 97,289
Mortgage-backed Agency Securities [Member]    
Securities available for sale, amortized cost 34,851 35,513
Securities available for sale, unrealized gains 92 14
Securities available for sale, unrealized losses (421) (773)
Securities available for sale, fair value $ 34,522 $ 34,754
[1] Derived from audited financial statements