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Note 3 - Debt Securities - Gross Realized Gains and Losses from Sale of Available-for-sale Debt Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Gross realized gains $ 419 $ 67 $ 0
Gross realized losses (34) (110) (618)
Net gain (loss) on sale of securities $ 385 $ (43) $ (618)