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Consolidated Balance Sheet (Unaudited) (Parentheticals) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 60,000,000 60,000,000
Common stock, shares issued (in shares) 40,859,738 40,453,462
Common stock, shares outstanding (in shares) 40,859,738 40,453,462
Treasury stock, shares (in shares) 57,759 0