Calculation of Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 28, 2021	Aug. 29, 2020
Numerator for Basic and Diluted Earnings Per Share:
Net income (loss)	$ 2,635	$ (1,147)
Undistributed earnings (loss), Basic	1,849	(1,927)
Undistributed earnings (loss), Diluted	$ 1,849	$ (1,927)
Denominator for Basic and Diluted Earnings Per Share:
Effect of dilutive securities dilutive stock options	273
Weighted Average Number of Shares Outstanding, Diluted	11,467	11,070
Basic
Numerator for Basic and Diluted Earnings Per Share:
Net income (loss)	$ 2,635	$ (1,147)
Diluted
Numerator for Basic and Diluted Earnings Per Share:
Net income (loss)	2,635	(1,147)
Common Stock
Numerator for Basic and Diluted Earnings Per Share:
Undistributed earnings (loss), Basic	1,582	(1,646)
Undistributed earnings (loss), Diluted	$ 1,588	$ (1,646)
Denominator for Basic and Diluted Earnings Per Share:
Weighted Average Number of Shares Outstanding, Basic	11,194	11,070
Weighted Average Number of Shares Outstanding, Diluted	11,467	11,070
Net income (loss) per share:
Earnings Per Share, Basic	$ 0.20	$ (0.09)
Earnings Per Share, Diluted	$ 0.20	$ (0.09)
Common Stock | Basic
Numerator for Basic and Diluted Earnings Per Share:
Less dividends	$ 673	$ 667
Common Stock | Diluted
Numerator for Basic and Diluted Earnings Per Share:
Less dividends	673	667
Common Class B
Numerator for Basic and Diluted Earnings Per Share:
Undistributed earnings (loss), Basic	267	(281)
Undistributed earnings (loss), Diluted	$ 261	$ (281)
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 income (loss) per share:
Earnings Per Share, Basic	$ 0.18	$ (0.08)
Earnings Per Share, Diluted	$ 0.18	$ (0.08)
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