Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2020
Sep. 30, 2020
Statement Of Financial Position [Abstract]    
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value per share (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized (in shares) 15,000,000 15,000,000
Common stock, shares issued (in shares) 8,416,145 8,416,145
Common stock, shares outstanding (in shares) 7,506,160 7,492,524
Treasury stock at cost, shares (in shares) 909,985 923,621