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Consolidated Balance Sheets (Unaudited) (Parentheticals) - $ / shares
Jun. 30, 2023
Dec. 31, 2022
Preferred stock, par value, in dollars per share $ 0.01 $ 0.01
Preferred stock, shares authorized 50,000,000 50,000,000
Preferred stock, shares outstanding 0 0
Common stock, par value, in dollars per share $ 0.01 $ 0.01
Common stock, shares authorized 300,000,000 300,000,000
Common Stock    
Common Stock, Shares, Issued 134,651,380 134,651,380
Treasury Stock, Common    
Treasury Stock, Common, Shares 6,965,071 7,278,651