Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Dec. 02, 2023	Nov. 30, 2024	Dec. 02, 2023
Numerator for Basic and Diluted Earnings Per Share:
Net loss	$ (751)	$ (1,797)	$ (161)	$ (570)
Undistributed loss	(1,604)	(2,642)	(1,864)	(2,258)
Undistributed loss	$ (1,604)	$ (2,642)	$ (1,864)	$ (2,258)
Denominator for Basic and Diluted Earnings Per Share:
Effect of dilutive securities dilutive stock options	0	0	0	0
Weighted Average Number of Shares Outstanding, Diluted	12,315	12,226	12,258	12,198
Basic
Numerator for Basic and Diluted Earnings Per Share:
Net loss	$ (751)	$ (1,797)	$ (161)	$ (570)
Diluted
Numerator for Basic and Diluted Earnings Per Share:
Net loss	(751)	(1,797)	(161)	(570)
Common Stock
Numerator for Basic and Diluted Earnings Per Share:
Undistributed loss	(1,395)	(2,295)	(1,620)	(1,961)
Undistributed loss	$ (1,395)	$ (2,295)	$ (1,620)	$ (1,961)
Denominator for Basic and Diluted Earnings Per Share:
Weighted Average Number of Shares Outstanding, Basic	12,315	12,226	12,258	12,198
Weighted Average Number of Shares Outstanding, Diluted	12,315	12,226	12,258	12,198
Net loss per share:
Earnings Per Share, Basic	$ (0.05)	$ (0.13)	$ (0.01)	$ (0.04)
Net income per share:
Earnings Per Share, Diluted	$ (0.05)	$ (0.13)	$ (0.01)	$ (0.04)
Common Stock | Basic
Numerator for Basic and Diluted Earnings Per Share:
Less dividends	$ 742	$ 734	$ 1,481	$ 1,466
Common Stock | Diluted
Numerator for Basic and Diluted Earnings Per Share:
Less dividends	742	734	1,481	1,466
Common Stock Class B
Numerator for Basic and Diluted Earnings Per Share:
Undistributed loss	(209)	(347)	(244)	(297)
Undistributed loss	$ (209)	$ (347)	$ (244)	$ (297)
Denominator for Basic and Diluted Earnings Per Share:
Weighted Average Number of Shares Outstanding, Basic	2,049	2,052	2,049	2,052
Weighted Average Number of Shares Outstanding, Diluted	2,049	2,052	2,049	2,052
Net loss per share:
Earnings Per Share, Basic	$ (0.05)	$ (0.12)	$ (0.01)	$ (0.04)
Net income per share:
Earnings Per Share, Diluted	$ (0.05)	$ (0.12)	$ (0.01)	$ (0.04)
Common Stock Class B | Basic
Numerator for Basic and Diluted Earnings Per Share:
Less dividends	$ 111	$ 111	$ 222	$ 222
Common Stock Class B | Diluted
Numerator for Basic and Diluted Earnings Per Share:
Less dividends	$ 111	$ 111	$ 222	$ 222