Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares
Mar. 31, 2021
Dec. 31, 2020
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0 $ 0
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares, issued 18,442,821 18,329,593
Common stock, shares, outstanding 17,136,553 17,081,831
Treasury stock, shares repurchased 1,306,268 1,247,762