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Consolidated Balance Sheets (Unaudited) (Parentheticals) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 27,430,000 26,413,000
Common stock, shares outstanding (in shares) 27,430,000 26,413,000