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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Common stock, no par value
Common stock, shares authorized 20,000,000 20,000,000
Common stock, shares issued 10,400,000 10,400,000
Common stock, shares outstanding 10,400,000 10,400,000
Treasury Stock, shares 1,114,739 1,134,120