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CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
CONSOLIDATED BALANCE SHEETS [Abstract]    
Preferred stock par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 1 1
Preferred stock, shares outstanding (in shares) 1 1
Common stock par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 225,000,000 225,000,000
Common stock, shares issued (in shares) 45,100,771 43,931,484
Common stock, shares outstanding (in shares) 45,072,463 43,913,136
Treasury stock, shares (in shares) 28,308 18,348