Calculation of Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 29, 2020	Aug. 31, 2019
Numerator for Basic and Diluted Earnings Per Share:
Net (loss) income	$ (1,147)	$ 157
Undistributed losses, Basic	(1,927)	(618)
Undistributed losses, Diluted	$ (1,927)	$ (618)
Denominator for Basic and Diluted Earnings Per Share:
Weighted Average Number of Shares Outstanding, Diluted	13,167	13,087
Basic
Numerator for Basic and Diluted Earnings Per Share:
Net (loss) income	$ (1,147)	$ 157
Diluted
Numerator for Basic and Diluted Earnings Per Share:
Net (loss) income	(1,147)	157
Common Stock
Numerator for Basic and Diluted Earnings Per Share:
Undistributed losses, Basic	(1,646)	(527)
Undistributed losses, Diluted	$ (1,646)	$ (527)
Denominator for Basic and Diluted Earnings Per Share:
Weighted Average Number of Shares Outstanding, Basic	11,070	10,990
Weighted Average Number of Shares Outstanding, Diluted	11,070	10,990
Net (loss) income per share:
Earnings Per Share, Basic	$ (0.09)	$ 0.01
Earnings Per Share, Diluted	$ (0.09)	$ 0.01
Common Stock | Basic
Numerator for Basic and Diluted Earnings Per Share:
Less dividends	$ 667	$ 662
Common Stock | Diluted
Numerator for Basic and Diluted Earnings Per Share:
Less dividends	667	662
Common Class B
Numerator for Basic and Diluted Earnings Per Share:
Undistributed losses, Basic	(281)	(91)
Undistributed losses, Diluted	$ (281)	$ (91)
Denominator for Basic and Diluted Earnings Per Share:
Weighted Average Number of Shares Outstanding, Basic	2,097	2,097
Weighted Average Number of Shares Outstanding, Diluted	2,097	2,097
Net (loss) income per share:
Earnings Per Share, Basic	$ (0.08)	$ 0.01
Earnings Per Share, Diluted	$ (0.08)	$ 0.01
Common Class B | Basic
Numerator for Basic and Diluted Earnings Per Share:
Less dividends	$ 113	$ 113
Common Class B | Diluted
Numerator for Basic and Diluted Earnings Per Share:
Less dividends	$ 113	$ 113