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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
Sep. 30, 2020
Sep. 30, 2019
Dec. 09, 2015
Common Shares Class A Non-Voting [Member]      
Common stock, par value (in dollars per share) $ 1.00    
Common stock, shares authorized (in shares) 15,000,000    
Common Shares Class B Voting [Member]      
Common stock, par value (in dollars per share) $ 1.00    
Common stock, shares authorized (in shares) 1,040,000    
Common Stock [Member] | Common Shares Class A Non-Voting [Member]      
Common stock, par value (in dollars per share) $ 1    
Common stock, shares authorized (in shares) 15,000,000    
Common Stock Shares Issued (in shares) 8,487,604 8,432,220  
Shares available for purchase through retirement plans (in shares) 500,000    
Shares authorized for issuance of grants under equity compensation plan (in shares)     331,500
Common Stock [Member] | Common Shares Class B Voting [Member]      
Common stock, par value (in dollars per share) $ 1    
Common stock, shares authorized (in shares) 1,040,000    
Common Stock Shares Issued (in shares) 881,452