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CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares
Mar. 31, 2021
Dec. 31, 2020
CONSOLIDATED BALANCE SHEETS    
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) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 20,000,000 20,000,000
Common stock, shares issued (in shares) 16,013,279 15,982,815
Common stock, shares outstanding (in shares) 15,999,814 15,911,984
Treasury stock, shares (in shares) 13,465 70,831