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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2018
Mar. 25, 2017
Common stock, shares outstanding 17,960,881 17,960,881
Preferred stock, par value $ 0 $ 0 [1]
Preferred stock, shares issued 0 0 [1]
Class A Common Stock [Member]    
Common stock, par value $ 0 $ 0 [1]
Common stock, shares issued 10,242,911 10,242,911 [1]
Common stock, shares outstanding 10,242,911 10,242,911 [1]
Class B Common Stock [Member]    
Common stock, par value $ 0 $ 0 [1]
Common stock, shares issued 7,717,970 7,717,970 [1]
Common stock, shares outstanding 7,717,970 7,717,970 [1]
[1] Retrospectively revised (see note 18)