Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available-for-sale, amortized cost	$ 400,731	$ 420,207
Common stock, par value (in dollars per share)	$ 2.00	$ 2.00
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	10,891,672	10,792,999
Common stock, shares outstanding (in shares)	10,891,672	10,792,999
Net unrealized gains on available-for-sale securities, income taxes	$ 1,697	$ 245