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Unaudited Condensed Consolidated Balance Sheets (Parenthetical)
Mar. 31, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Class A Common Stock    
Common stock, par value (in dollars per share) | $ / shares $ 1 $ 1
Common stock, shares outstanding (in shares) | shares 5,452,830 5,397,458
Class B Common Stock    
Common stock, par value (in dollars per share) | $ / shares $ 1 $ 1
Common stock, convertible conversion ratio 1 1
Common stock, shares outstanding (in shares) | shares 1,568,554 1,568,670