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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - € / shares
Jun. 30, 2021
Dec. 31, 2020
Common stock, par value (in EUR per share) € 0.01 € 0.01
Common stock, shares authorized (in shares) 798,096,000 798,096,000
Common stock, shares issued (in shares) 231,246,958 228,806,301
Common stock, shares outstanding (in shares) 228,188,566 226,324,559
Treasury stock, shares (in shares) 3,058,392 2,481,742