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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2020
Dec. 31, 2019
Preferred stock, par value (in dollars per share) $ 1,000 $ 1,000
Preferred stock, authorized shares (in shares) 30,000 30,000
Preferred stock, liquidation preference per share (in dollars per share) $ 1,000 $ 1,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized (in shares) 20,000,000 20,000,000
Common stock, shares issued (in shares) 13,934,996 13,934,996
Common stock, shares outstanding (in shares) 13,787,160 13,716,445
Treasury stock, shares (in shares) 147,836 218,551